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Why do you think he's holding his hands together in his profile photos? He's praying he'll be able to make it back to the surface!Mo2vation once bubbled...
Regarding the light, this isn't O-Ring's JATO bottle here... the 4.5 works out to less than -1 I think. Heck, O-Ring probably has a PFD on under his drysuit with that V2 he's diving. He's probably the only diver on the planet adding floatation, not taking off weight.