This one really reminded me of The Dark Lurking except the performances were a lot better. In order to tell you the real problem though, I've got to spoil something so if you just want to see it for yourself without knowing anything, stop reading. Ok, here it is: there aren't any monsters in this movie. With the corridors from Alien and Aliens, you really expect some creatures or demons or something, but all you get is one animal that was experimented on. When I was watching it, I was excited since that happens kinda early on so I thought that was the tip of the iceberg. Nope, that's it. What they do instead is alright, but it would've been awesome with some unique, terrifying monsters. They've got some pretty cool characters with good actors in the roles. The thing is it all reminds me of Aliens minus the other major component of what made that film so memorable. By using that aesthetic and not delivering the goods, they shot themselves in the foot. It's not awful, but it could've been amazing.