Via decreased HR, lower vagus nerve stimulation, and peripheral vasoconstriction → shunting of blood to heart, brain, lungs (preventing collapse) = mammalian dive reflex, Master Switch of Life, triggered just by splashing cold water on your face, and more so the deeper you dive.Similar in other animals: ducks, seals- “the biological functions of Weddell seals reverse in deep water the seals… actually seemed to gain oxygen the longer and deeper they dove.”.Something odd about being underwater that allows humans to withstand the pressures that should be impossible by Boyle’s Law- our lungs somehow don’t collapse.Bring at high pressure for extended times → mild delirium from increased nitrogen in blood.Aquarius = one of last remaining oceanic research institutes not reliant on robots for exploration (at 60 feet).First underwater habitats/contraptions → very dangerous, risk of “the bends”: actually because of pressurized environment of built structure, not of being so deep.Algae (produces 70% O2 on Earth), coral.Photic zone = sunlit region depth ranges from 40 ft in murky waters to near 600 in tropics.
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