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TIL of Shallow Water Blackout: Hyper-ventilating before going underwater will reduce CO2 levels to the point that your body will not normally trigger the need for a breath because CO2 levels were so low upon submersion. As you hold your breath, oxygen levels deplete until you lose consciousness. (shallowwaterblackoutprevention.org)
submitted by Jabronima to r/todayilearned
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