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We use here the CisLunar SwitchBlock for staging and deco.
Considering the scene yesterday, it's the most current here.
We went on this wreck and the guys before us going in are 
loaded down with 2 deco stage bottles and their doubles but
full face masks everywhere. They each carried 2 to 3 ffms
per person. It was hilarious. Sliding into the water one would
start free flowing, so they'd get that one fixed, then the other
would start. Those things have to create drag too, and because
they didn't tie them off, they were "draggin" them everywhere. 
It was also rather sad to see that the normal diving mask was
simply clipped off creating more drag. On the exchange side one
guy said he switched masks and it took him 8 !!!! minutes before
he was calmed down.

scotter

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