Underhell UE4 Project Unofficial fan project. Made with Unreal Engine 4.25 and C++ All Source Engine Assets are temporary placeholder assets, and will be and are being replaced. The same applies for sounds.
It turns out that the Infected NPC that I had placed a few rooms earlier (the one that breaks the lever to a door after you leave the Butchery) had gone rogue. Since AI can open doors, the AI randomly wandered out of his room and into the Safe Room, which wasn’t locked either! Since he was able to open all the doors, he helped himself to a room full of enemies who have no weapons to defend themselves with. He slaughtered them all and wandered off, leaving me to find the massacre a few minutes later.