Pool Safety Important to Keep in Mind Heading Into Summer

ABC News' Gio Benitez reports on one common pool activity that could quickly turn deadly.
2:47 | 06/02/15

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Transcript for Pool Safety Important to Keep in Mind Heading Into Summer
We're back now with an important summer safety warning at the swimming pool. It's called shallow water blackout and it can strike when you hold your breath under water with both adults and children at risk. ABC's gio Benitez has more from a pool in state college, Pennsylvania, good morning to you, gio. We're at Penn state, we're here to talk about a new campaign to stop a silent killer. This summer you'll be jumping into the pool with your kids and a good chance, you're going under water. In pools across America, new warnings this morning about a danger just below the surface. Look at this underwater surveillance video, there on the left, a 13-year-old boy, in a slow-motion struggle to stay conscious. Now slowly sinking to the floor just as help comes in the nick of time. This experienced 18-year-old sinning to the bottom in mere seconds before being rescued. You're seeing shallow water blackout, essentially fainting after holding their breath under water for too long. A lack of oxygen to the brain causing the swimmer to pass out and if not rescued in time even drown. How long is too long to hold your breath under water. We usually say 30 seconds is about the limit. We don't people holding their breath for more than a minute. Because a child can drawn within 90 seconds. Reporter: They can be hard to track, but at least 7 have been documented across the country. Often they can happen in the least expected place. Most of these accidents occur in 3, 4 feet of water. Reporter: Now New York City and Santa Barbara, California, are the first cities to ban extended breath holding in public pools and this morning, warning signs like these are going up at pools across the country. Even Michael Phelps is sounding the alarm. Shallow water blackout occurs it's often fatal. But through education and understanding it can be 100% preventable. And so this morning, right now, what we want you to teach your kids is that when they go underwater, you don't want them to hold their breath but exhale. Watch this. Here we go. You're going to breathe in. And you saw those bubbles. You want them to exhale through bottle their nose and their mouth. Lara. That's great advice, gio. That pool is reminding me that I almost passed out from the workouts -- Yeah, that's your alma mater. Gio, thank you. Very important tips.

This transcript has been automatically generated and may not be 100% accurate.

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