It looks really rough right now, but you get the idea.
The Crawler’s Death Pit works like an automatic feeding system for the crawlers (spider-like creatures). Dead bodies left over from experiments are dumped into the pit to feed them.
The lights aren’t always red, they switch to red every two minutes, and a body drops from above into the pit.
Puzzle explanation (for context):
When the player enters the room, everything goes dark and the gates close (they rise from the floor).
Emergency lights activate, and several bodies fall into the pit. One of them carries the keycard.
Each connection point has a card reader.
The player must activate a lever that extends a catwalk halfway across the pit (it comes out from an indent in the cylinder of the pit). The catwalk stays extended for 15 seconds in single-player and only 1 second in co-op.
The catwalk uses metal grating, so players can see through the floor directly into the pit below.
You need to time it correctly to catch the body carrying the keycard as it lands on the catwalk.
This is a normal tile, meaning it has four connections, each positioned 15 meters apart. (I’ll attach you a base mesh with the correct scale below).
This tile belongs to the Sewers. It’s the dirtiest and most gore-filled area of the map, heavily infested with biomatter and alien eggs. Experiments are conducted there to force crawlers to implant the parasite for study, but most subjects die before transforming into an X-Terminator (basically Raatma and a Xenomorph love child).
This will be your working folder (Dropbox):
I’ll upload anything you might need there. I also added a few references there.
Here is also the .blend file with the exact dimensions and additional notes.