Extendair

n2diving

More like between one and two hours! (from the explantions I received)... the process occuring was that water was intermittently being introduced into the loop due to improper DSV technique (failing to completely close the DSV) during a pool training session that included various DSV removal and replacement drills that had been proceeding for over two hours... so certainly some the water that eventually made it through all the traps back to the diver had been in contact with the cartridge for well over an hour. This was the divers first experience on a Titan and in fact it was a very early experience on CCR's entirely.... so she was not experienced enough to recognise the more subtle early signs that something was gradually getting worse (some increased WOB, slight changes in bouyancy control, abnormal sounds, slight abnormal tastes/smells)... then some underwater gymnastics began that moved some of the water out of the scrubber into the inhalation side... and things go from bad to worse in a moment.

It's almost ironic... the flood did not produce an enourmous WOB. Because the cartridge tolerated so much water in the loop without making the WOB unacceptable... the water was allowed to contact the cartridge for long enough (over an hour) to raise the pH to caustic levels... and still the WOB was low enough to continue to be functional... if it had been granular I expect the scrubber would have just turned to a solid mass over a few minutes and the diver would be forced off the loop and out of the pool.