right if you were on a dive to 85 meters on a new wreck 25 minutes into it and you come across a sealed room in the wreck which has air trapped there, big enough area to get out of the water altoghather and sit there, so the question is
a, would you need to do decompression before going into that area
and
b, as it was air from the surface would it be safe to breath and not flip out?
max deapth of air 66 meters
just somthing to play with as i know cave divers have stage tents
graham