Quote: (Originally Posted by Nick uk.)
WHY WOULD YOU, even contenplate trying to sort out ANY kind of problem CC at ANY depth for ANY lengh of time, risking NOT BEING ABLE TO 'SORT' IT when you could (and IMHO should) bail out OC?
Now, i don't want to get into a slanging match, but go on, CONVINCE ME WHY!!
When faced with a problem underwater a smart diver will evaluate all his options look at the balance of risks for his particular current situation and chose the best solution out of those available to him.
There are times such as on a deep dive, long penetration etc when the potential risk of running out of bottom OC bail gas after bailing is higher (you could get lost inside wreck after bailing, loose the cave line after bailing, need to swim to upline, lost buddy, take longer than you planned to get out of the overhead, your RMV could be much higher than you planned for etc)
The fact you are deep means the balance of risk is shifted the safety margin on OC consumption is smaller. In these cases a diver might decide to extend the bottom OC bail gas by running it SCR. The only downside is small drop in FO2 - but if your bail gas is selected with a high enough FO2 you could end up with a reasonable or even the same effective ppo2 at depth as you were running as a setpoint anyway.