Added a fence mesh to cover the area with pipes next to the bucket machine. Still be careful, if you're going around with laser welder burning the walls and stuff you're probably going to spawn a burnt bullet hole in some little crevice that will impossible to find and or clean.

Added a blocking volume to the stairs leading to the incinerator room, and another to the stairs leading into the mine area.

Moved the little face hugger guy to another location. You'll need to stack some crates to reach him, or you might be able to smack him down with a broom or something.

Initial Upload.