voodoo47: no corruption so far.
and yeah, funnily enough, there are only four places in the entire game where you can fully submerge - the Recdeck swimming pool, and three flooded areas in Body of the Many (two of them cannot be skipped). that's probably why they didn't bother with a thief style oxygen bar.
Since there are so few places to completely submerge in the game, I didn't even think there was a problem. I jumped into the pool on the recreation deck and died. I figured dying in the water was by design and had something to do with my character's experimental implants, the water being irradiated, or in the case of the last levels, the water not being water at all, but being stomach acid. Imagine my surprise when I got to the last level and I can't even progress any further.
I had been wandering around in circles trying to find the damn membranes before I checked a walkthrough online. They said I had to go into the water to find them. Now I know I'm dealing with a game breaking bug.