If you want to take a long swim underwater, the trick is to breathe in and out a few times and take a big gulp of air before you submerge. Right? Dead wrong. Hyperventilating not only doesn't increase the oxygen in your blood, it also decreases the amount of CO2, the compound that informs the brain of the need to breathe. Without that natural signal, you may hold your breath until you pass out and drown. This is known as shallow-water blackout.
STAT: Drowning is the fifth largest cause of accidental death in the U.S., claiming about 10 lives a day. No one knows how many of these are due to shallow-water blackout, but its prevalence has led to the formation of advocacy groups, such as Shallow Water Blackout Prevention.
DON'T: Hyperventilate before swimming underwater, and don't push yourself to stay submerged as long as possible.
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