The Whistling Tunnel

I was shoving the response bag back into its compartment when the pager sounded. It was 03:52 on 18 April 2026, at the end of a 12-hour ambulance shift that had consisted mostly of transfers and one drunk man who had fallen from a garden wall in Huddersfield. My crewmate had already clocked off. One of my boots was untied and I had my waterproof half off.

The pager buzzed twice. That meant mountain rescue, not another medical call. Except it had been routed through ambulance control in the same way as a 999 call, which was unusual. Mountain-rescue alerts normally came directly from Gareth Hughes or through the duty controller.

I unclipped the pager from my belt and checked the screen.

POSSIBLE MISSING PERSON. BLACKSTONE TUNNEL AREA, MARSDEN. POLICE EN ROUTE. RESPOND IF AVAILABLE.

Blackstone Tunnel.

That was all I needed to see to know it would not be simple. I had been a member of the volunteer Pennine mountain-rescue team for three years. We covered the Colne Valley and the surrounding moors: steep cloughs, the River Colne, disused railway cuttings and moorland tracks where people loved to walk until they twisted an ankle or lost their bearings after dark.

Most incidents were straightforward. Find the person, walk them out, complete the paperwork. Blackstone Tunnel was different. It was a nineteenth-century railway tunnel driven straight through the Pennines near Marsden, and it was still active.

That meant passenger and engineering trains used it. The tunnel was roughly two kilometres long. There were no lights and no proper refuge walkway, only ballast, sleepers and rails. If you were inside when a train came through, there was nowhere safe to go.

Gareth, our team leader, had an entire speech about it. He had delivered it twice in the previous year alone.

Do not enter without police present. Do not enter without a Network Rail representative on scene. Do not enter until Network Rail has confirmed that traffic is stopped. Never assume the published movements are accurate.

The second time, he had looked directly at me. I was not very good at waiting when someone was missing.

I took my mountain-rescue vest from its hook and checked the pockets. Head torch working. Two sets of spare batteries. Radio clipped to the shoulder strap.

I had gloves, a whistle, marking tape, a compact first-aid kit and my Tuff Cut medical shears. I added a third set of batteries from the cupboard. Then I took a red emergency hand flare, kept for remote night rescues, from the ambulance and pushed it into the vest's side pocket. It was not standard kit for a tunnel search.

I simply thought that if I ended up inside Blackstone and a train came, I wanted something bright enough that a driver might see it and apply the brakes. It probably would not help, but carrying it felt better than carrying nothing.

Nina Patel's voice came over the radio while I retied my boot.

"Ambulance control to any mountain-rescue units responding to Blackstone. Be advised, the caller is at the walkers' car park off the A62. Three people entered the tunnel at approximately 23:10. Two returned at about 03:30 and called 999. One person remains unaccounted for."

I keyed the microphone.

"MRT Four responding. ETA fifteen minutes."

"Received, MRT Four."

Three had gone in. Only two had come back. That bothered me. I pulled on my waterproof and headed for my car.

The cold rain had begun about an hour earlier, light but steady. It made the tarmac shine and reduced the Pennine ridges to dark shapes barely distinguishable from the sky. I knew the route: east from Huddersfield along the A62 towards Marsden.

It was about nineteen kilometres. The roads were empty at that hour. There was only me, the rain and the white markings sliding beneath my headlamps.

Nina came back over the radio.

"MRT Four, additional information. Caller is Jamie Fletcher, male, twenty. He says the missing person is Ravi Sethi, also male, twenty. A third member of the group, Lewis Cartwright, returned with him. All three are students at the University of Huddersfield. They entered to explore the tunnel.

"Fletcher reports hearing screaming inside and seeing a light moving deep within the tunnel. He also reports hearing a sound, quote, 'Like a train.' No train emerged."

I clicked the microphone twice in acknowledgement.

A moving light, screaming and a train-like noise. Ravi could have had a torch. He could have fallen, injured himself and screamed. The noise did not fit.

Unless a train had been inside and Jamie had simply failed to see it emerge from the far portal. But he would have heard it. He would have felt it. Trains shook the ground inside those old tunnels.

The rain grew heavier as I left Huddersfield behind, and I increased the wiper speed.

Nina's voice crackled again.

"MRT Four, be advised Fletcher is extremely distressed. Police on scene say he is crying and, quote, 'Not making much sense.' It is unclear whether the missing person is injured or lost."

"Received."

Extremely distressed. That probably meant Jamie had seen something frightening enough to make him leave his friend behind. People did not do that unless panic overwhelmed them.

Or unless something chased them out.

I did not like that thought.

The road followed the valley, the slopes on either side visible only as deeper patches of darkness. There were no lights apart from my headlamps and the occasional dim square of a farmhouse window high on a hillside.

Gareth would be furious if I entered without him. He lived near Holmfirth and was at least half an hour away. West Yorkshire Police were already on scene, but getting a Network Rail mobile operations manager out before dawn could take an hour or more.

Network Rail did not keep someone waiting beside Blackstone Tunnel in case university students decided to trespass.

I was not planning to go in. Not immediately. But if Ravi was injured, bleeding, hypothermic or trapped, an hour was a long time.

I stopped at a temporary signal controlling overnight roadworks and checked my mobile. Two bars. I considered ringing Gareth to tell him I was on my way, but he would only order me to wait. I would hear it from him in person soon enough.

The signal changed and I drove on.

Nina's voice crackled from the radio.

"All units, Gareth Hughes is en route from Holmfirth. ETA thirty-five minutes. West Yorkshire Police are now on scene."

Thirty-five minutes.

I told myself I would arrive, speak to Jamie and get a clearer idea of what had happened. Perhaps Ravi would emerge by himself before I reached the portal. It was possible. People became frightened, separated and later found one another again.

It did not explain the moving light or the train sound, but I had heard stranger accounts from panicked witnesses.

The access point was a small stone-surfaced walkers' car park off the A62. I had been there once before in daylight during a training exercise. It was the main approach for people who wanted to see the tunnel without actually entering it. A path descended through the trees to the east portal, roughly four hundred metres away.

I turned off the A-road and followed the narrow access lane. My headlamps caught the reflective markings on a police van parked at the edge of the car park. There was one other vehicle, a small hatchback that probably belonged to the students.

I parked beside the van and switched off the engine. Rain drummed steadily against the roof, muffling everything beyond the car and making the rest of the world seem distant.

For a moment I remained there with one hand on the steering wheel.

Blackstone Tunnel. Before dawn. Two people out.

One person still inside.

A light. Screaming. The sound of a train.

Gareth's voice repeated itself in my head. Do not enter without police and a Network Rail representative. Police were here. That was something.

I pulled on my vest and checked my head torch once more. Its beam was bright and steady. I switched it off to preserve the battery, opened the door and stepped into the rain.

The car park looked larger than I remembered. Perhaps that was because I had forgotten the memorial at its edge: a roughly three-metre bronze figure of a navvy, pick raised above one shoulder, rain streaming down his face and work clothes. It stood on a stone plinth where the car park met the path, commemorating the men who had built the tunnel.

Bethan Shaw's vehicle was already there. She stood beside the open boot with a coil of rope over one shoulder and a harness clipped to her belt. She looked angry. Not with me, specifically. Just angry in the general way she always did when cold rain dragged her out before dawn.

She did not greet me or even nod.

"Radio's bloody useless out here. Keeps cutting in and out. Tried Gareth twice and got nothing but static."

That worried me. We were still in the open. If the radios were already losing signal, they would be worthless inside the tunnel.

I tested mine anyway.

"MRT Four to control."

Static answered. Then Nina's voice emerged, faint and broken.

"Copy... barely receiving..."

I released the microphone.

"Yes. That's bad."

Bethan did not reply. She was looking past me towards the police van and the hatchback beside the path marker. A roads-policing sergeant stood beneath the overhang of a wooden information board, speaking to someone I could not yet see.

"The caller?" I asked.

"Yes. The lad's a wreck. The other one is in the back of the van."

"The other one?"

"The one who came out with him."

"Right."

Nina had said that two students returned. I had been concentrating so hard on the missing one that I had not properly absorbed it.

I checked the equipment on my vest. Head torch, batteries, medical shears and the flare in the side pocket. Bethan had the rope and harness. Between us, we had enough equipment for a basic extraction if it came to that.

I crossed to the information board. The sergeant moved aside when she saw my vest.

The student sheltering beneath the overhang looked exactly as Nina had described. He was about twenty, wearing a soaked hoodie, jeans and trainers that were probably ruined. His face was pale and his eyes were red.

He had been crying.

"Jamie Fletcher?" I asked.

He nodded rapidly.

"Yes. Yes, that's me."

"I'm Callum Price, mountain rescue. I need you to take me through what happened. Names first. Who went in with you?"

"Ravi. Ravi Sethi. And Lewis. Lewis Cartwright."

I took out my mobile and entered the names in a note.

Ravi Sethi, missing. Lewis Cartwright, returned.

"What time did you enter?"

"About 23:10. Maybe a few minutes after."

"All three of you?"

"Yes."

"And you came back out when?"

"I don't know. About 03:30. I don't know." His voice cracked. "Lewis came out first. I stayed back because I thought Ravi was right behind him, but he wasn't, and then I heard-"

"Slow down," I said. "Lewis came out first. You're certain?"

"Yes."

"Where is he now?"

Jamie glanced towards the police van.

"He's in there. The police put him in because he wouldn't stop shaking."

"Did Lewis say anything?"

"No. He just... He won't talk. He won't even look at me."

I recorded that. Non-verbal. Trembling. Avoiding eye contact.

Shock, perhaps. Maybe hypothermia.

"And Ravi is still inside?"

"Yes. I heard him screaming."

"Screaming what?"

"Nothing. Just screaming. And there was a light far back in the tunnel. It was moving."

"Moving how?"

"I don't know. Side to side, as if he was running."

"Did you hear a train?"

Jamie's face tightened.

"I heard the wheels. Or brakes. That shrieking sound they make in a tunnel. But no train came out."

I studied him.

"You're certain?"

"I stood there for ten minutes. Nothing came out."

That did not necessarily mean much. The noise might have come from deeper inside and the train might have stopped or taken another route beyond the western portal. I did not tell him that.

"All right," I said. "Stay here. Don't go anywhere."

He nodded again, his chin moving in quick little jerks.

I returned to Bethan. She was inspecting the rope, feeding the coil through her hands to check for knots or damage.

"Ravi Sethi is still inside," I said. "The other returnee is Lewis Cartwright. He's in the police van."

Bethan looked towards it.

"Is he all right?"

"I don't know yet."

I crossed to the van. The sergeant saw me approach and opened the rear door.

Lewis Cartwright sat on the bench seat with his knees together and his hands resting in his lap. Wet hair clung to his forehead. His dark jacket was soaked through. He was shaking, but not as though he were cold. It looked as if something inside him had come loose and was rattling.

His eyes were fixed upon the beginning of the path that led down towards the tunnel.

"Lewis," I said.

He did not look at me.

"Lewis, I'm with mountain rescue. Can you tell me what happened in there?"

Nothing.

His mouth hung slightly open and his breathing was fast and shallow. I crouched until I was level with him.

"Did you see Ravi? Is he hurt?"

Still nothing. His eyes did not move.

He stared at the path as if it were the only thing left in the world.

I had seen shock many times: after road traffic collisions, falls and drownings. People shut down. They could not speak, move or process what had happened.

Lewis looked like that, but there was something beneath it. Something that felt more like terror than confusion.

I stood and stepped back. The sergeant closed the door.

"Has he been like that the whole time?" I asked.

"Since I arrived," she said. "He won't speak. Won't move unless somebody physically guides him."

I looked back through the rain-streaked window. Lewis's face was a pale blur behind the glass.

That was enough for me. I did not need perfect details or a coherent account. One student remained inside the tunnel, and another had emerged looking as though he had seen the end of the world.

That was real. Whatever had happened in Blackstone was real.

I walked back to Bethan.

"We're going in."

She stared at me.

"Gareth's about fifteen minutes away."

"Ravi has been in there since 23:10. That's nearly five hours."

"Network Rail?"

"Not here."

"Callum."

"I know."

She held my gaze for a moment. Then she sighed and unclipped the harness from her belt.

"You're lucky I arrived prepared."

"Yes."

She stepped into the harness and tightened it, then passed me the high-output rechargeable search torch we used for night recoveries. I switched it on and tested the beam. It was broad, clean and intensely bright.

Bethan took a spare head torch from her vehicle and tossed it to me.

"Backup."

I clipped it to my vest, and we headed down the path.

It was narrow and muddy, and the rain had made the exposed roots treacherous. The path descended through the trees for about four hundred metres before opening at the east portal.

The entrance was a high arch of dark red brick, streaked with rust and water stains. The mouth was roughly five metres wide and four metres high. There were no lights and no gate, only the arch and the twin rails vanishing into blackness.

I switched on my head torch. Bethan did the same. Our beams penetrated perhaps ten metres before the darkness swallowed them.

"Keep to the right," I said. "If a train comes, press yourself against the wall."

"If a train comes, we're dead," Bethan said.

"Probably."

She did not laugh.

We stepped onto the track. Ballast crunched beneath my boots. The old wooden sleepers were splintered and slick with rain. I tested my footing and kept the search torch aimed forwards.

The tunnel swallowed us.

The first fifty metres were what I had expected: wet, cold brickwork, old rails, and the smells of stone, iron and standing water. Our head torches glanced from the curved walls and sent shadows leaping around us. Every step echoed. I held the search torch steady and swept it from side to side every few paces.

Nothing.

Only rails, ballast and brick.

After about a hundred metres, the sound of the rain faded. The portal behind us had narrowed to a small grey oval. A little beyond two hundred metres, I smelt it.

Hot grease. Frying oil. The thick, clinging smell that rolled from a cafe extractor fan.

I stopped. Bethan halted behind me.

"What is it?"

"Can you smell that?"

She sniffed.

"Yes. What is it?"

"I don't know."

It made no sense. The tunnel should have smelt cold and damp, perhaps faintly mouldy. It should not have smelt hot or greasy.

I continued. Ten paces later, I realised that our echoes were wrong.

Our footsteps should have sounded close and sharp. The tunnel was narrow, with brick surrounding us on three sides. The sound ought to have returned quickly and tightly.

It did not.

The echoes were smooth and distant, as if the tunnel were several times wider than it appeared. I stopped and stamped once upon the ballast.

The sound returned soft and late.

Bethan had heard it too.

"That's not right."

"No."

I turned and directed the search torch across the walls. Solid brick stood perhaps three metres away on either side. I faced forwards and stamped again.

The echo said the walls were fifteen metres away.

The sound was lying.

The folding stool stood perhaps six metres ahead, beside the track. I raised a hand and Bethan stopped behind me.

The search torch picked out clean metal legs and a canvas seat. It was the sort of new folding fishing stool someone might carry to a Sunday-league football match. It was not old or rusted. The fabric was still taut, without the slightest sag in its centre.

"You see that?" I asked.

"Yes." Bethan's voice was flat. "I see it."

I approached, keeping the beam fixed upon it.

The stool had been placed less than a metre from the rail, angled as though someone had sat there to watch the tunnel stretching away in front of them. There was no mud on its feet and no water pooled in the canvas, although condensation dripped from the overhead brickwork every few seconds.

I did not touch it.

"That wasn't here during the exercise," Bethan said.

"No. And it shouldn't be here now."

"No."

She moved alongside me and swept her head torch over the stool, then beyond it. Her beam found something else about three metres farther in, standing between two sleepers.

A Greggs takeaway cup.

It was medium-sized and perfectly upright, precisely centred between the sleepers. It was half full. When I angled the search torch down, I could see the liquid line through the paper.

"That's impossible," Bethan said.

I crouched beside the rail and examined it. The cup was not crushed or tilted. Its sides were clean, without dirt or streaks, and the lid remained firmly fitted.

It looked as if someone had set it down thirty seconds earlier and walked away.

"Trains use this tunnel," I said. "The vibration alone would knock it over."

"I know."

"And we're hundreds of metres in."

"Who carries a takeaway coffee this far into an active railway tunnel?"

Bethan did not answer. She was staring beyond the cup, deeper into the tunnel where our lights failed to reach.

Her hand had moved to the carabiner on her harness. She clicked it open and shut, open and shut. It was a nervous habit I had seen before.

I stood and unclipped the radio from my vest.

"MRT Four to control. Do you copy?"

Static burst from the speaker, louder than before and sharp enough to make me pull the radio away from my ear. Then a voice cut through it.

Male. Clipped and steady.

"Four, confirm your..."

It sounded like somebody who knew me, somebody who had used my unit designation a hundred times. Before I could identify the speaker, the transmission dissolved into white noise and a faint hiss that might have been wind, interference or something else.

I tried again.

"Control, this is MRT Four. We are inside the tunnel, several hundred metres from the east portal. Confirm you copy."

Nothing answered but static.

I clipped the radio back to my vest.

"Gareth?" Bethan asked.

"I don't know. It cut off too quickly."

She clicked the carabiner twice more, then stopped and looked at me.

"We should go back."

I said nothing.

"Callum, we should get out and wait for Gareth, the Network Rail manager and whoever else is coming. We've already breached protocol, and now we have..."

She gestured towards the stool and the cup.

"Whatever this is."

She was right. I knew she was right. We had already broken the rules by entering without Network Rail confirmation that traffic had been stopped. Now we had found objects that made no sense in a place that should have been empty except for Ravi Sethi.

The sensible course was to withdraw, regroup and return with more people and reliable communications.

I nearly agreed.

Then I swept the search torch ahead one last time, checking the next stretch before we turned around.

The beam found someone sitting against the wall.

I froze.

Bethan saw him too. Her breath caught beside me.

He was a young man, perhaps twenty, sitting with his back pressed to the bricks and his knees drawn against his chest. Both hands were clamped over his ears. His head was lowered, chin tucked down, but I could see wet hair plastered across his forehead and a dark jacket shining with water or something worse.

"Ravi?" I called.

He did not move.

I advanced, holding the light on him. Bethan remained half a step behind me, her head torch adding a second beam and throwing his shadow long and crooked across the tunnel wall.

From six metres away, I saw his face clearly.

My stomach dropped.

"That's Lewis," I said.

Bethan stopped.

"What?"

"That's Lewis Cartwright. The student who came out. The one sitting in the police van."

"That isn't possible."

"I know."

But it was him. The same slight build, the same dark jacket, the same narrow chin and thin mouth, the same pale skin, although it looked even paler under our lights. He was soaked and trembling, his hands still sealed over his ears as if he were trying to exclude a sound we could not hear.

I approached slowly.

My boots ground against the ballast. Lewis flinched but did not raise his head.

"Lewis," I said, keeping my voice low and even. "My name is Callum. I'm with mountain rescue. I'm here to help."

There was no response.

I stopped about two metres away and crouched to bring myself closer to his level. The search torch was too bright at that distance, so I angled it towards the ground. My head torch illuminated his face more gently.

"Lewis, can you hear me?"

His breathing was fast and shallow. His chest hitched beneath the jacket. His fingers pressed so hard against his ears that the surrounding skin had turned white.

"I need you to look at me," I said. "Just look at me so I know you're all right."

For several seconds, nothing happened.

Then he lifted his head.

His eyes were wrong. Not their shape or colour. They were light brown, perhaps hazel in proper light. It was the way they looked: cloudy and dull, as if a film had grown over them or all focus had been drained away.

At first he stared beyond me, tracking something over my left shoulder. Then one hand dropped from his ear and he pointed deeper into the tunnel behind me.

I spun round and raised the search torch. Its beam cut through the darkness and found nothing.

Only rails, sleepers and brick fading into black.

Bethan had raised her light too, sweeping the tunnel in controlled arcs.

"I can't see anything."

I turned back to Lewis.

He was still pointing, his arm now fully extended. His mouth had opened slightly, but no sound emerged. There was only the same shallow breathing, faster now and close to panting.

"What is it?" I asked. "What's back there?"

He neither answered nor blinked. He continued to point.

I moved closer and reached for his wrist to check his pulse.

"I'm just going to-"

My fingers touched his skin and I nearly recoiled.

He was cold. Not chilled by rain or tunnel air, but cold as if he had been sitting in a freezer. His skin was slick with something that was not water. It felt oily and faintly tacky, and it did not wipe away when I adjusted my grip.

There was a pulse, but it was too slow. Perhaps fifty beats per minute when it should have been seventy or eighty, especially in someone showing signs of shock.

"Lewis, I need you to speak to me. Are you hurt? Is Ravi still in here?"

Nothing. His wide, unblinking eyes remained fixed upon the darkness behind me.

Bethan crouched at my side and directed her light at his other arm.

"Callum."

I looked.

A line encircled his forearm roughly five centimetres below the elbow. It was thin and exact. There was no blood or scab, and it did not resemble a cut. It was a seam so precise that it might have been drawn with a ruler, as though a narrow band had once been wrapped around the limb and left a perfect impression when removed.

"What the hell is that?" I asked.

Bethan leaned nearer, keeping her light steady on the mark.

"I don't know."

I touched the line with one gloved finger. The surrounding skin felt like the rest of him: cold, slick and wrong. The seam itself was slightly raised, with the texture of scar tissue that had healed far too quickly.

"Lewis," I said again. "What happened to your arm?"

He did not answer or move. His other hand remained extended towards the dark.

I heard his jaw working before I saw it.

It was not a click or a pop. It was a grinding noise, somehow wet and mechanical at the same time. Lewis's mouth remained slightly open and his breath still came in quick, shallow gasps, but something shifted within his face.

His jaw moved from side to side as if adjusting itself. Then his lips pulled back just enough to expose his teeth.

That was when the shriek began.

It poured from him, long and rising, then falling before it rose again. It was the exact sound of steel wheels and brakes screaming inside a tunnel, the noise carrying the hint of a locomotive horn beneath it. I had heard trains braking on the trans-Pennine line countless times from the ambulance-station yard.

But this did not come from farther along the tunnel or from outside.

It came from Lewis. From his open mouth. From his throat.

My head torch flickered once, the beam dipping before it steadied. Bethan's did the same.

Lewis's eyes remained fixed behind me. His arm was still pointing, and his mouth continued to produce that rising, falling shriek without any pause for breath. His chest did not move as it should have done if air were leaving his lungs.

I opened my mouth to speak. Perhaps I meant to say his name. Perhaps I meant to tell him to stop.

I never found out.

Lewis snapped towards Bethan.

He did not turn. He snapped, his entire body pivoting at the waist in one smooth movement. There was no preparation, no shifting of weight. It was far too fast for somebody who had been sitting catatonic against a wall.

His cloudy eyes locked upon her and his mouth opened wider.

Far wider than it should.

It was not a yawn or a scream. His jaw descended beyond the point where ligaments should have stopped it, beyond the limit imposed by bone. The hinge simply continued to open.

The shriek grew louder and higher, dividing into two simultaneous notes: the rising two-tone scream of wheels and brakes, with a locomotive horn buried beneath it.

Bethan did not freeze. She lunged forwards, seized the front of his hood in both hands and tore it back from his head.

His skull was wrong.

The shape was distorted, too smooth across the top, as though the crown had been pressed flat or capped with something that did not quite match. His hairline sat lower on one side. Around his temples were faint edges, more seams, as if separate pieces had been fitted together and smoothed over imperfectly.

The wet hair plastered across his forehead did not move like hair. It looked painted on.

Bethan said something, but I did not hear it.

My mind was still trying to force what I saw into a medical explanation. A skull fracture. A haematoma. Swelling.

None of it worked. Swelling did not create seams. Fractures did not make a person's head look as though it had been dismantled and reassembled by something without the correct instructions.

Lewis's mouth remained open. The shriek continued to pour out.

I seized Bethan's arm and dragged her backwards.

It was pure instinct. There was no thought and no decision. My hand closed around the sleeve of her waterproof and I pulled hard, wrenching her off balance and away from Lewis, away from that malformed skull and that sound.

Lewis rose.

He did not push himself from the floor, brace with his hands, shift his weight or use his legs as a person did when standing. He simply rose, smooth and vertical, as if something had hooked into the centre of him and lifted.

Then he stepped forwards.

One foot, then the other, in perfect rhythm. Each foot landed squarely on a sleeper without hesitation or adjustment for the uneven ballast between them.

Sleeper. Sleeper. Sleeper.

As though he were walking along a balance beam. As though he had done it a thousand times.

The shrieking did not stop. It rose and fell, ricocheting from the bricks.

I turned and ran.

Bethan was half a step ahead of me. Her boots struck the sleepers in quick, uneven beats, nothing like Lewis's measured rhythm. I still carried the search torch, its beam lurching wildly across the walls and roof. It caught the folding stool as we passed, then the upright Greggs cup and the darkness beyond.

The tunnel mouth should have been drawing nearer.

We were running as fast as the uneven ground allowed. We had walked several hundred metres into the tunnel. At that pace, the grey outline of the eastern portal should have appeared within a few minutes.

It did not.

The darkness ahead remained solid and unbroken.

I kept running. My lungs began to burn and my boots slipped on the wet sleepers. Still I could not see the arch or the faint glow of the outside world that should have been visible even before dawn in heavy rain.

"Help!" Bethan shouted.

One word, loud and clear above our pounding boots and ragged breathing.

Then I heard it again.

"Help!"

The same word in the same voice, delayed by half a second.

It sounded as though someone else had repeated it farther along the tunnel, but echoes did not return that cleanly. They changed. They blurred and distorted.

This had not distorted. It had simply repeated her.

I bit down hard on my tongue. Pain flared, sharp and immediate, and I tasted warm copper.

That was real.

The shrieking was no longer only behind us. It was ahead as well, the same rising and falling pattern, the same impossible two-tone harmony of brakes and horn. It came from both directions at once, surrounding us and filling the tunnel.

I could no longer judge its distance. The sound destroyed any sense of space. It made the tunnel feel as if it were contracting and expanding at the same time.

Bethan found my sleeve and gripped it. I did not look at her. I kept my eyes forwards and kept moving, although the exit came no closer and the shrieking was everywhere.

My head torch began to flicker again, dimming and recovering as if its battery were dying, although I had checked it less than twenty minutes earlier.

Then I saw the door.

It was set into the right-hand wall, perhaps ten metres ahead. A rectangular metal door lying flush with the brickwork. Faded orange and white infrastructure markings had been stencilled across it, most of them worn beyond recognition. It resembled the sort of maintenance access door one might expect on Network Rail property.

Except I had never seen it before.

It had not been there during the training exercise. It had not been there when we passed the same section minutes earlier. The wall had been continuous brick, as unbroken as the wall opposite.

Now there was a door.

I slowed. Bethan slowed with me, still clutching my sleeve, her breathing quick and ragged. The shrieking continued both ahead and behind as my torch beam settled upon the metal.

It appeared solid. Dull grey steel, streaked with rust around the edges. Its handle was a simple lift-and-pull latch.

I stopped a metre away and stared.

That was where the chapter seemed to end inside my head: Bethan beside me, the door in front of us and the shrieking everywhere.

Bethan reached for the latch. I did not stop her.

I probably should have. I should have considered the alternatives, assessed the risks and made some sort of tactical decision. But the noise came from both directions, my head torch would not stop flickering, and I wanted nothing except to escape that tunnel.

She lifted the latch and pulled.

The door opened at once.

Warm air flowed out. It was not hot, merely warm, but it was the wrong temperature for a maintenance chamber buried deep beneath the Pennines during cold rain in April.

The smell came with it. The greasy odour I had noticed before was stronger now, thick enough to taste. Motor oil and something else.

Something organic beneath it.

I pushed Bethan through, followed her and hauled the door shut behind us without thinking.

The shrieking stopped.

There was absolute silence except for our breathing.

I stood with my back against the door, one hand gripping the handle on this side and my chest heaving. Bethan pressed herself to the opposite wall, her head torch swinging as she looked around.

The search torch remained in my other hand. I had forgotten I was holding it.

The corridor seemed to belong to a completely different world.

The poured-concrete floor was smooth and clean, with a faint shine as though it had recently been sealed. The concrete walls were painted industrial white. Fluorescent strip lights ran along the ceiling.

Real fluorescent lights, the sort found in offices or school corridors. They buzzed with a constant electrical hum, the kind of sound people usually stopped noticing.

At that moment, it was the loudest thing I had ever heard.

Yellow lines ran along the centre of the floor, perfectly straight, their paint crisp and bright. About five metres ahead, mounted high in one corner, a CCTV camera watched us with a single glowing red light.

I blinked and looked again.

It remained there: a black dome, its red indicator steady and unblinking, aimed directly at the door through which we had entered.

"Callum," Bethan said.

Her voice was flat and controlled, the voice she used when working very hard not to panic.

"I see it."

"Where the hell are we?"

I did not answer. I was trying to construct a normal explanation. A Network Rail maintenance tunnel. A service corridor for railway staff. That could make sense.

Railways had infrastructure. They had security cameras. They had lighting and concrete and-

I turned my head and saw the hooks.

Six heavy steel hooks were bolted to the wall a little over two metres above the floor, the kind used for hanging tools or coats. Five held railway safety helmets, some white and some orange, each bearing faded Network Rail-style markings. They had been arranged in a neat row.

At first they looked ordinary. Standard safety equipment.

Then my light caught the interior of the nearest helmet.

Hair was tangled through the suspension webbing.

Not a few strands. Clumps. Thick clumps of dark hair tangled in the plastic straps inside the safety helmet, as though someone had been wearing it when something yanked them out of it, or pulled them through it.

I moved the beam of the search torch along the row.

Every helmet contained hair. Different colours. Black, brown, fair. One with streaks of grey.

Another had something else caught in the webbing, something dark and dried that I did not want to examine too closely.

Trophies.

The word came into my head and would not leave.

"Don't," Bethan said.

I looked at her. She was staring at the helmets too, one hand gripping the carabiner on her harness, her knuckles white.

"We need to move."

I nodded. She was right. Standing there staring would not help us. The corridor extended for about ten metres before ending at a doorway on the left.

There was no door in the frame, only an open rectangle of darkness. The fluorescent strip lights continued beyond it, stretching farther along the corridor, but I could not see where they ended.

We walked on. I kept the search torch aimed ahead.

Our boots made flat sounds against the concrete. Too loud, but without any echo. Bethan stayed close, her shoulder almost touching mine.

The doorway opened into a storeroom. I swept the torch across it and stopped.

Packed-lunch boxes. Dozens of them, perhaps fifty, stacked on metal shelving that covered three walls from floor to ceiling. Some were new, bright plastic in red and blue, the sort sold by Tesco or Argos.

Others were old metal boxes, rusted at the corners, their handles worn down to bare steel. A few had rotted through, their fabric sides collapsed and mouldering. Each bore a name, not written but scratched into its surface.

It looked as though someone had used a nail or screwdriver to carve the letters into the plastic or metal.

I stepped closer and angled the torch to read them.

Jenkins. Morrison. T. Hall. Perez.

Names and initials, some neat, others barely legible. I moved the light down the shelves, scanning them one after another while my mind tried and failed to understand what I was seeing.

Then I found it.

On the third shelf from the bottom, pushed towards the back behind two newer boxes, sat a green metal packed-lunch box with a black handle. Its surface was pitted with rust. A name had been scratched across the front in capital letters, spelt correctly.

PRICE.

I froze.

My surname was carved into a box that looked forty years old, sitting on a shelf in a room that should not have existed beneath Blackstone Tunnel.

"Callum." Bethan's voice was tight. "I see it. Is that...?"

"Yes."

I took one step back, then another. My hand rose without any conscious decision, palm held towards the shelf as if I could stop the thing from being real by pushing hard enough.

Bethan caught my arm and pulled me towards the doorway. I did not resist.

I wanted out of that room. Away from the box. Away from my name scratched into something that had apparently been there longer than I had been alive.

I backed into the corridor and signalled to her with one flat hand, fingers together.

Do not touch anything.

She nodded quickly.

We kept moving. The corridor turned right, then opened into a wider space.

I smelled oil and metal, with the same organic rot beneath them. It looked like a maintenance bay. The space was about six metres across, with a ceiling that sloped down towards the rear. The concrete floor was stained dark in patches and descended at a steady gradient, vanishing into darkness beyond the reach of my torch.

Equipment had been fixed to the walls. Tool racks. A workbench. A pegboard with spanners and hammers hanging in perfect rows.

Everything was clean. Everything was organised.

And the air was moving.

It was not wind or ventilation. It pulsed up the ramp towards us in slow, regular intervals.

In, then out.

In, then out.

Breathing.

I felt it against my face, warm and damp and wrong.

Bethan stopped beside me. I heard her breath catch.

Mounted above the workbench on the wall to our right was a railway possession and movement board, the sort that used magnetic route labels to track trains and engineering work.

I raised the torch.

The first column listed destinations.

MARSDEN.

HUDDERSFIELD.

Then, below them, three more.

MOUTH.

THROAT.

BELLY.

Beside each destination was a time. Marsden and Huddersfield had normal entries: 04:42 and 06:08.

The others had numbers too, but they did not fit any valid 24-hour clock.

Bethan made a sound, not a word, just a quiet noise in her throat.

I did not look at her. I kept the light on the board and read it again, trying to force it to say something different.

It did not.

Behind us, along the corridor we had entered by, the fluorescent strips began to dim. Not all at once. One by one, beginning at the far end. Each fell to half brightness, then a quarter, the darkness advancing towards us in a rhythm I recognised.

Footsteps.

Something was walking along the corridor.

I spun and aimed the search torch back the way we had come.

The corridor was empty. Faded floor markings. Hooks bearing helmets.

Another strip light dimmed, closer now.

"Callum," Bethan said.

I ran back towards the door through which we had entered. The metal door with the faded orange Network Rail-style markings. Our way out. Back to the tunnel, the east portal, the walkers' car park and the world that made sense.

I reached for the handle.

There was none.

The surface was smooth metal, without latch or hinges, a flat rectangle of steel set flush with the concrete wall.

I pressed both hands against it and pushed. Nothing. I shoved harder, driving my shoulder into the steel.

The door did not move. It did not rattle or yield by so much as a millimetre.

My glove slipped across the surface. I pulled my hand away and held it beneath the torch.

Fresh grease, dark and slick, coated my palm.

It had not been there before. The door had been dry when I pulled it shut.

Another strip light dimmed behind us.

Bethan moved past me, quick and deliberate, unclipping the coil of rope from her shoulder. She found a thick steel pipe running along the wall near the entrance to the maintenance bay, probably intended for water or drainage and secured to the concrete with heavy brackets.

She clipped the rope to it with a carabiner, tested the anchor with her weight and looked at me. Her face was pale, her jaw set.

She pointed down the ramp into the darkness.

We had to descend and find another way out.

Bethan went first, one hand on the rope. I followed half a step behind, aiming the search torch past her shoulder. The concrete sloped steadily and smoothly beneath our boots.

There were no cracks or seams, only that endless gradient drawing us deeper with every step.

The air continued to pulse.

In, out.

In, out.

Warm, wet and rhythmic.

I tried not to think of breathing. I concentrated on the circle of light ahead, the back of Bethan's jacket and the rope running through her gloved hand.

The grease from the sealed door still coated my other palm. I could feel it through the glove now, slick and wrong.

Halfway down, I saw something small and rectangular glowing on the floor.

I stopped and raised a hand. Bethan halted too and glanced back.

"What?"

I directed the torch down and to the left. The beam caught it clearly: a mobile lying face-up on the concrete, about two metres from the wall. It had a black case and a spiderweb crack across the screen, but the display was still lit, glowing pale blue-white in the dark.

I stepped towards it while Bethan remained on the rope.

It was a recent smartphone. The crack ran from corner to corner, but I could still see the display beneath it.

I crouched without touching it.

A video application was open, paused or buffering. A small circle turned in the centre of the screen as though the mobile were trying to send the file.

I pulled off my glove with my teeth and tapped the screen with one bare finger.

The video began to play.

There was no sound, only shaky footage of the tunnel. Brick walls, railway lines and darkness ahead. The timestamp in the corner read 23:51.

The image lurched as whoever held the mobile walked forwards. Their breath misted the lens for a moment, then cleared.

The wall on the right began to move.

It did not crumble or crack. It opened.

The bricks peeled back slowly and wetly, separating along lines that had not existed a second before. They drew apart in sections like lips spreading wide.

The camera jerked away, then snapped back as though the person holding it could not stop looking.

The tunnel wall folded open. Something stood within the gap, in the space between the bricks and whatever lay behind them.

It was wearing a human body.

Not inhabiting it. Not possessing it. Wearing it.

I could see the edges where the skin did not fit properly, seams pulled tight across joints that bent the wrong way. The face sagged loosely around the eyes and mouth like a mask made from someone's actual flesh.

The thing beneath moved, and the body moved with it, dragging and stretching. The skin split slightly at the wrists.

I killed the screen.

My hand was shaking. I pressed the side button twice and the display went black.

I remained crouched on my heels for three seconds, breathing through my nose and tasting blood where I had bitten my tongue earlier.

"Callum," Bethan said.

I shoved the mobile into a pocket of my rescue vest and stood quickly.

"Evidence."

"Ravi's mobile?"

"Yes."

She stared at me.

"Are you certain?"

"Yes."

I did not tell her what I had seen. We had no time, and I did not know how to explain it in words that would make sense.

I pulled my glove back on and aimed the torch down the ramp.

We continued.

The bottom arrived sooner than I expected. The concrete simply ended. The slope levelled, the walls widened, and we stepped from the ramp on to something else.

Rails.

Two of them ran parallel into the darkness, the same gauge and spacing as the railway in the tunnel above.

But they were not steel.

They were black. Dull black, without shine or rust.

From a distance their surfaces appeared smooth. Up close, I could see fine grooves running lengthways, with thin ridges and tiny pits and hollows.

Organic.

The rails looked as if they had grown rather than been laid.

I crouched and held my hand close to one without touching it.

Bone. That was what it resembled.

Polished bone. Long, weight-bearing and wrong.

The rail hummed beneath my palm, a low frequency I felt in my teeth.

Bethan made a sound behind me.

I stood and directed the torch ahead.

Someone was standing about ten metres away, directly between the rails and facing us.

The figure wore a high-visibility vest, yellow-green with silver reflective strips that caught my light, dark trousers and work boots. One raised arm held an old railway lantern with a wire handle and glass chimney. The flame within it burned steady and orange.

I stepped forwards.

Bethan seized the back of my jacket.

"Wait."

"Someone's here," I said.

I kept my voice calm and practical. It might be a railway worker. They might know another way out.

The figure did not move or lower the lantern. It simply stood there, the flame lighting it from beneath.

I approached. Bethan came with me, one hand still gripping my jacket, the rope trailing behind her all the way to the steel pipe at the top of the ramp.

At five metres, I stopped.

I could see the vest clearly now, every reflective strip and line of stitching.

I could also see that the figure had no face.

Where its eyes, nose and mouth should have been, there was only smooth skin. Flat and unbroken. The lantern light struck it from below, making the pale, waxy surface glow faintly. The skin was stretched tight, without a single feature.

My throat closed.

The figure tilted its head, slowly and deliberately, like someone studying an unfamiliar object.

Then it raised its free hand and pointed.

Not at both of us. At me.

It lowered the hand, touched its own chest, pointed down towards the rails, then pointed at me again.

I did not move.

The smooth face turned slightly towards Bethan and then back to me. Its hand repeated the sequence.

Chest. Rails. Us.

Then it raised two fingers and tapped them together twice.

"It's trying to tell us something," Bethan whispered.

"I know."

The figure lowered both hands. It took one step backwards, its boot settling where a sleeper should have been, and raised the lantern higher.

I heard my own voice come out thin, but steady enough.

"We need help. Someone is missing. Ravi Sethi, a university student. Have you seen him?"

The figure remained still.

Then it turned in one smooth, controlled half-circle until the back of its vest faced us. The reflective strips caught my torch and flared brilliantly.

It turned back.

Where the blank face had been, there was now a mouth.

Only a mouth.

The lantern illuminated it fully. The lips were drawn back, teeth exposed, the tongue pressed flat. It held the exact shape of a scream, but no sound emerged.

Ravi's mouth.

I knew it was his. I did not understand how, but I knew.

The rest of the face remained blank and smooth. Only that mouth had been cut into the skin, wet and dark within, stretched wide and locked open.

I tore the red emergency hand flare from my vest pocket, the one we kept for remote night rescues. I pulled off the cap and struck it against the rough strip on the side.

It sparked and caught. Red flame and smoke poured from the end.

I held it between us and the figure.

The red light washed across everything.

The rails became darker. The walls seemed farther away. The high-visibility vest changed.

The yellow-green material was not fabric. It was a tightly woven mesh stapled directly into flesh.

The reflective strips were stitched through skin. Their edges were puckered and raw where the staples bit deeply.

The chest beneath rose and fell slowly and unevenly. The vest moved with it, tugging at the staples and stretching the skin.

The blank face rippled. The mouth remained fixed, but the skin around it shifted and folded.

For half a second, I saw Ravi's entire face beneath the surface. His eyes, nose, cheeks and hairline pressed up from underneath as if he were trapped behind cling film.

Then the skin smoothed again.

Only the mouth remained, wide open and silent.

I threw the flare.

It struck the ground less than two metres in front of the figure and rolled, spitting red sparks and smoke across the bone rails.

I grabbed Bethan's arm and dragged her backwards.

"Go. Now."

She turned and ran. I ran with her, one hand on her shoulder and the other holding the search torch.

The rails began to vibrate, gently at first, then harder. A deep, rhythmic shudder travelled through the bone, into the concrete, through my boots and up my legs.

Something was coming.

I did not look back. I did not need to.

I could feel it.

Pressure built behind us, driving the air forwards. From deep in the darkness came the rising two-tone shriek of steel wheels and brakes in a tunnel, blending with the first note of a locomotive horn.

Bethan reached the foot of the ramp and began to climb. I was directly behind her.

The vibration surged.

A wave rolled through the ground and threw Bethan sideways. She landed hard on her hands and knees. The rope snapped taut, and I heard her suck air through her teeth.

I hauled her upright by the back of her harness.

Both gloves were shredded. Blood covered her palms, dark and wet.

"Move," I said.

She moved.

We fought our way up the ramp. The faded lines along both sides of the floor began to twist. They curved inwards, reaching towards us as though they had been painted on something living.

The walls narrowed.

Or perhaps we had grown wider. I could not tell. Everything felt wrong.

I kept one hand against Bethan's back and pushed her onwards.

At the top, the corridor had vanished.

A solid brick wall ran from left to right, floor to ceiling. There was no opening, no door and no seam.

Bethan struck it with both palms and shoved. Nothing happened.

I swept the search torch across the bricks. They looked real, old and tightly mortared.

Then I saw it.

A hairline vertical seam ran from floor to ceiling, about a metre to our left.

I dropped the torch and pulled the Tuff Cut medical shears from my vest. They were part of my response kit, carried for seat belts, clothing and anything else that needed to be cut quickly. Stainless steel, blunt-tipped, with a serrated edge.

I forced the tip into the seam and prised.

The brick moved.

It did not crack or crumble. It bent like rubber or soft plastic.

The edges drew apart. The seam widened, and cold, damp air poured through, smelling of wet leaves, rain and the world outside.

I dropped the shears, thrust both hands into the gap and pulled.

The brick stretched. It tore. It opened.

Bethan pushed her hands in beside mine, despite her injured palms, and together we ripped the opening wider until there was room to crawl through.

She went first.

I pushed her into the gap and climbed after her, my vest catching on the edge. The brick felt cold and slick beneath my hands.

We fell through and landed hard on wooden sleepers and ballast.

Real sleepers. Real stone.

I rolled on to my back and looked up.

Above me was the curved brick arch of Blackstone Tunnel, streaked with water and moss. Normal.

The air smelled of rain.

Bethan was already standing, limping and holding one injured hand against her chest.

I got up, caught her good arm and ran.

The east portal appeared ahead, filled with pale grey morning light. Dim, but real.

We sprinted through it and out into the rain, past the small stone-surfaced walkers' car park and the roughly three-metre bronze memorial to the navvies who had built the tunnel.

Sergeant Helen Morris stood beside a West Yorkshire Police van, her waterproof police cap shining with rain. She was tall and solidly built.

Beside her was a man in an orange contractor's waterproof and a white safety helmet. Martin Webb, Network Rail's mobile operations manager. Finally on scene.

They both turned as we came up the path. Sergeant Morris stepped towards us.

"What happened?"

I pulled Ravi's mobile from my vest and held it out.

"Found this inside. It belongs to Ravi Sethi."

"And Ravi?"

"He's gone."

She took the mobile, examined the cracked screen, then looked at me.

"Gone how?"

"I don't know. We searched and couldn't find him. We encountered hazards and had to retreat."

Martin was staring at Bethan's hands.

"She needs medical treatment."

Bethan sat on the wet stone and peeled off her gloves. Both palms were torn and bleeding, with loose strips of skin hanging from them. She did not make a sound.

I knelt beside her and opened my response bag, reaching for gauze, tape and antiseptic wipes.

My hand struck something hard.

I looked down.

There was a packed-lunch box inside my bag.

It was small, plastic and bright blue, the sort a child might take to school. It had not been there before.

I had packed the response bag myself. I knew every item in it.

Slowly, I lifted the box out.

A name had been scratched across the lid in rough letters.

PRICE.

The plastic was warm. Not hot, merely warm, as though someone had been holding it.

I snapped the lid shut, buried the box beneath the gauze, antiseptic and the rest of my supplies, then zipped the bag closed.

Sergeant Morris was speaking, asking questions. I answered on automatic.

"Yes, approximately one and a half kilometres inside. No. No visual contact with Ravi Sethi. Yes, there were structural hazards."

"What kind of hazards?"

"I can't specify. It was dark, and we had to move quickly."

Every answer was evasive, but technically true.

Bethan said nothing. She simply allowed me to clean and dress both her palms.

When I had finished, I walked to my car, placed the response bag on the passenger seat and started the engine.

Gareth Hughes arrived as I was reversing out of the car park. He climbed from his vehicle and signalled for me to stop.

I lowered my window by a few centimetres and told him my written report would follow, but that I needed to take Bethan to A&E.

He let me go.

I drove west along the A62, back through Marsden and towards Huddersfield. Rain fell steadily, and the windscreen wipers ran at full speed.

Bethan followed in her own vehicle. I could see her headlamps in the mirror.

Somewhere beyond Slaithwaite, I heard it.

Faint and distant.

A locomotive horn.

Long, low and steady.

Its rhythm matched my pulse exactly.

I switched on the radio and turned up the volume. Then I drove on through the rain.

The blue packed-lunch box remained inside my response bag.

It was still warm.

I did not open it.