What really happened at Site 13 remains a mystery, but MTF soldiers AP-3 Houston and Ross are determined to get to the bottom of it. There is a small group of survivors buried somewhere in the dark realms of this abandoned facility trying to fight their way through the swarms of SCP's that have been freed. Bobble the Clown warns our heroes, but perhaps the only people that can save the mission aren't actually human at all, but cyborg units Onru and Irantu. (imdb)