What all is the compressed air used for in SH3? I was under the impression that it was used as an oxygen supply for the sub crews and for blowing the water out of the tanks when trying to come to the surface quickly... However last night I performed a test with my crew where I stayed submerged for a long period and time compressed. I watched my CO2 level rise all the way up and my crew reported "50% oxygen left", but my compressed air hadn't moved. So does this mean that the compressed air is used solely for surfacing and has nothing to do with the air they breathe? What else do you use compressed air for in SH3? I never checked my gauges much before GW's, now I'm noticing stuff like this...