Under the ice i always have a redundant back up.
Cold water if im diving single tank, my regs are right tuned down for the cold water. I have been involved in gas sharing at close to max depth on the forest city in tobermory, in 0 C water and no free flow.
I generally dive 2 tanks at all times, and my regs are always tuned for cold water, it always seems to be cold temps here in the great white north so no need to ever tune em for warm.
Cold water if im diving single tank, my regs are right tuned down for the cold water. I have been involved in gas sharing at close to max depth on the forest city in tobermory, in 0 C water and no free flow.
I generally dive 2 tanks at all times, and my regs are always tuned for cold water, it always seems to be cold temps here in the great white north so no need to ever tune em for warm.