Here is a story from my dad I think you guys will appreciate.
Back in the 80s my dad worked for a company producing cables and communications equipment. The various buildings and offices of the company formed a pretty big site across many acres of land.
In one part of the complex was a large building used for some assembely, but mainly as a storage warehouse (think of the Amazon warehouses- racks of goods ready to be shipped out). Linked off this was a one kilometer long tunnel/corridor, which was used to stretch out cables along a track for testing, probably about eight foot high and six or so wide. One door of the tunnel linked straight to the warehouse, and the other to a small shed, with tools and other odds and ends. The shed had another door which took you outside, but was always kept locked for obvious reasons.
Anyway it was during a night shift that a guy called John was testing out a sample of copper cabling on the track. He was the only person in the tunnel, everyone else being in the canteen/break area at the far end of the warehouse from his perspective (which was the only other way out of the warehouse). The tunnel is fairly well lit, but dim enough that you still required a torch to do any delicate work. John is halfway down the tunnel fiddling with the line of cable when he pauses, looking down to the other end of the tunnel.
He notices that the light in the shed is on (there being an internal window as well as the door), but thinks little of it. Seconds later however he notices the door to the shed swing open, yellow light flooding out. John by this point is a little concerned that kids have broken in, and tries to focus, but can't see anything. Seconds pass when he realises there is something running down the tunnel towards him. Fast. The shillouette of the figure was big, and quickly making ground. John does the honourable thing and craps his pants, drops the torch and starts running for the warehouse, despite by all accounts being six foot tall, and built like a brick shit house, and so could certainly run with some pace.
He starts to look back every few seconds, and far from losing the guy, the figure is still gaining on him, closer and closer, until the last time John looks behind him there is less than 50 metres between them. John bursts through the door into the warehouse, and doesn't stop sprinting until he reaches the canteen area.
Of course the other nightshift guys are quite bemused by John running over to them in such a hurry, only to see that he is as white as a sheet. They ask what is wrong, and John tells them he has just been chased right down the tunnel by a big bloke.
Still thinking it is a kid, the other guys grab torches and had back down the tunnel with John, thankful for apparent safety in numbers. Very quickly it's obvious that the tunnel is empty, and the lights are once more switched off in the shed. Laughing, thinking that John has been spooked by some local kids, everyone soon goes quiet when the external door in the shed is found to still be locked from the inside.
After that no one dared work in the tunnel on their own anymore.
I have one or two more from that place if anyone is interested.