Stuck in Doom... need to find Sarge

[moralpanic]

My objective is to find Sarge and stop him, but i don't know where to go. I'm in the CPU center, the routing level to be exact, and cleared everything, but now i'm unusre where to go.

 

[Fistandantilus]

Find the bridge, and you'll find a door you need to go through. Figure out how to get through that door