Help in self destructing building...

[Ryanrk]

I'm in the self destructing building and where i'm lost at is the part where you go into the second pressure chamber and it's starts counting down to destruction. What i'm i suppose to do, if it counts down to zero i get killed and that room seems completely sealed. I can't seem to shoot my way out or anything. I've looked for switches and stuff before i get in, but i can't seem to find anything.. Is there some sort of secret i'm missing?

Thanks
Ryan

[MasterOfImages]

I won't tell you the answer outright (the puzzle is too simple for that ), but I'll tell you that the answer involves shooting something...

[Eternal]

I just fire the M79 at the glass in the room (be outside the room when you do it)