Help I am stuck on this game, I know its a kinda unknown title but I am hoping some of you guys have played it.  I've tried google searching for walkthroughs with no joy (obviously too soon).

Anyway for anyone who is playing it.  I am at the Marsh refinery, after the lift has crashed and I am in a room with four gas pipes which I have opened with the wrench and I have absolutely no idea what to do now.

Any help would be much appreciated. Cheers