Deathly Shallows

How Breath-Holding Becomes DeadlyProlonged underwater breath-holding can be deadly. Here's a look at what happens physiologically to cause a shallow water blackout drowning.

Risk AssessmentMore than 80 percent of Aquatics International readers are aware of shallow water blackout, but significantly fewer (55 percent) have rules against the prolonged underwater breath-holding that perpetuates this potentially deadly phenomenon, according to a 2011 survey.

Risk AssessmentMore than 80 percent of Aquatics International readers are aware of shallow water blackout, but significantly fewer (55 percent) have rules against the prolonged underwater breath-holding that perpetuates this potentially deadly phenomenon, according to a 2011 survey.

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