Quote: (Originally Posted by imwax3)
Silly q's but I was wondering exactly how deep and how long one can stay underwater using a ccr. Is there any publications I can get to start to study for my course certificate on rebreathers? Very new to this sight and read were cedric went down I believe 636 ft. Which is nuts. But hope to reach that level of comfidence one day.
"Nuts" is a very relative point of view. There are folks I'd consider safer at 600' on their RBs, than others in a half full bathtub at home.
When you get to expedition/exploration level diving, you usually have in place support operations that you don't have otherwise. Habitats for deco on those 20 hr dives, for example.
To give a relatively meaningfull answer to how deep/how long, Very experienced divers seem to see 400 to 450' as a practical limit with overall runtimes exceeding 4, 5, maybe 6 hrs as getting into the uncomfortably long zone, and about as far as you'd want to push most of the better scrubbers.