 He found a secret underground tunnel in his new apartment, and it led to a creepy secret. When Irishman Daniel Carly saw an available studio apartment with suspiciously cheap rent, he leapt at the chance to move in. It was only after he'd already unpacked his stuff that he began to notice something very strange about the apartment. As if Carly didn't find the decor weird enough, he also found a secret underground tunnel in the place. Being below the building, Carly discovered a lot more than he'd bargained for. It turns out there's often a good reason why apartments go cheap. Sometimes you're better off leaving the things that hide below your living space alone. When Daniel Carly first saw a new apartment listed online, he snapped it up as soon as he could. Daniel didn't even bother to view the property, as he was sure that, for the price, the place would go quickly. It turns out that he might have been a bit too hasty. Only after moving his stuff in, Carly began discovering strange things about the property. The building was at least a century old, and had very high ceilings and some very unusual architecture. But even more recent renovations seemed off-putting. There were mirrors everywhere throughout the apartment. This wouldn't seem that strange by itself if there were only a few, but there were too many mirrors, floor to ceiling, making the place constantly look like it's full of other people even when Carly was alone. There's not a lot of horizontal space in the property, so the bedroom is nestled on a mezzanine floor. With no guardrail, Carly needed to be careful not to roll out of bed, as he'd fall down into the living room below. More mirrors, hinting that whoever lived here before was into some weird stuff. Both the walls and the ceiling in the bedroom, were covered in mirrors, which doesn't seem like the behavior of a normal person. What was going on here? Hard way up the wall in the kitchen, there was a hole. This doesn't seem to exist for any logical reason, but it does give us a clue as to the building secrets. It turns out that there are plenty more hidden surprises in this place. What initially looks just like part of the floor reveals something far more disturbing. Just outside the bathroom was a hatch that wasn't included in the listing for the apartment online. What could be hiding down here? Taking a closer look, it's clear that this hatch must be in regular use. There's a latch on it so that someone can open and close it, and it stands out from the floor so that it's easy to lift up, or push up from underneath. At first, Carly simply thought that this was some storage space. There was a sorted junk down here that must have belonged to a previous tenant, as is common in many older rental properties. But then Carly noticed something chilling. There are steps in this space. Hidden in the darkness was some kind of underground tunnel that leads below the apartment. So is this simply a basement, or something more sinister? Fully prepared with a flashlight, Carly began making his way down the steps. Everything was pitch black, and he assumed this space couldn't be that big. He was wrong. The tunnel led all the way under the building, snaking and twisting through several rooms. It seemed that this dungeon led all the way under the other apartments in the building. Even as Carly went further into the basement, he couldn't see an end in sight. Only this had been part of the building before it had been converted into apartments. There were bricked up windows that must once have led to other, now inaccessible rooms. But soon Carly found signs that people had been here more recently. Graffiti on a wall made it clear that people had been down here recently, or, at least, as recent as the invention of spray paint. But what possible reason would anyone have for coming down here, and was there another way in or out of the tunnel? Carly found some disturbed ground, along with some form of grate. There was no brick here, just loose soil. While Carly joked that this might be some kind of grave, it does make sense that there might be bodies buried in the area, especially if the building was an old monastery, as Carly suspected. A large raised brick structure could well be a place where someone slept once upon a time. Or, alternatively, this basement may be the final resting place for a previous owner of the building. With the house this old, it's hard to tell what may have once existed here, and what might still be hiding in the shadows. The presence of fuse boxes suggests that this place is in regular use. Presumably engineers must need to get down here periodically, but how they get in and out isn't entirely clear. There's also plenty of loose live wires hanging around, suggesting that the dungeon isn't exactly safe. Exploring further, Carly found himself directly underneath many of his neighbors' apartments. Do they have access to the dungeon as well? And if so, how safe is it for Carly to sleep in his apartment without something heavy blocking the entrance to this entire underground maze? It turns out the floors throughout the building aren't exactly soundproof. Down here, Carly could hear his neighbors in conversation with each other, while spying underneath their floorboards. So has anyone been doing the same thing to him since he moved in? Finally, Carly managed to find a date relating to when someone was previously in the tunnel. An old newspaper, dated April 10, 1984 made it clear that someone was down there 30 years ago. Although, of course, this doesn't prove that someone else hadn't been there more recently. The tunnel system was full of debris and junk from previous residents of the building. There's even a large wooden door that looks like it must be very old, tucked away in one corner of an underground room. For now, Carly simply has to hope that nobody else has a hidden door within the dungeon that can let them in and out.