http://bugs.winehq.org/show_bug.cgi?id=34674
--- Comment #3 from WineBuG winebugs140@gmail.com --- (In reply to Bruno Jesus from comment #2)
I can only find expired download links in the thread, except for a link on mediafire. It would be interesting to have a before and after save. To check the air supply fields through the files to try understanding what could be happening.
The problem is that it isn't exactly known when this bug happens. So it's difficult to talk about "before" and "after". Maybe someone should try to examine debug traces created when saving/loading the game?
There was a workaround file posted on GOG.com forums (http://www.gog.com/forum/system_shock_2/system_shock_2_mac_cant_dive/post135) which deactivates the air supply value (just put it in the game's folder). I will also attach it here.