[Kars]

I have to ask for futher details, but this is what I know from the top of my head.

They used 1 regulator on a 5m hose to the tank placed in the middle of the pool. And I'm sure it was done for an extended time. I quess for an our, being observed by juries from the National CMAS.

I remember we did an similar exersize with about 6-8 people, where it was indeed pretty hard, but manageble to partially exhale, exhale a bit through to clear the regulator and take 1 breath and pass on the regulator to the next in line. We did it only for something like 10 minutes, as a fun game with an educational twist to help people understand that one has some margine in case of regulator problems.

Need to email them for the exact story.

Kars