Transcript for Lifeguard Rescue Video Highlights How to Spot a Drowning Person
a summer safety alert before you head out to the pool, Lara, are you going to tell us about what's going on here. I am, robin. You have to be careful. Someone could be drowning right in front of you and you may not realize it until it's too late. ABC's Reena ninan here with warning signs that everybody needs to know about. Good morning to you, Reena. All my soon-to-be 3-year-olds wants is a birthday pool party to celebrate her birthday but after hearing this statistic children under 5 are most at risk for drowning even with adults nearby got me rethinking that. It could happen in an instant. And in plain sight, drowning, the pool danger that can claim a life before anyone around even notices. Watch this video just posted this week. Dozens of swimmers in this public wave pool but can you spot the one in distress? Here in the middle of the screen a young boy falls off his inner tube and immediately starts struggling, people around him do not even seem to notice. Luckily the eagle-eyed lifeguard responds within seconds saving the boy. Now with public pools ochoing for the season across the country, safety experts are urging parents to stay vigilant for the sometimes subtle signs of drowning. The leading cause of accidental death for children under 5. Somebody! Help! Reporter: When the movies have the person that's making all sorts of motion and everything else, that is not really what it's like. If a person can make that sort of noise and everything else, they might be in trouble but they're still okay. Reporter: This swimmer is not. He's showing the telltale signs lifeguards watch for. Often they can't scream out or wave arms. They're not able to do anything but gasping for air or control their move manies to wave for help or try to attract attention. Reporter: Some reports estimate in 10% of drownings adults nearby have no idea what's happening. Watch this husband just feed away from his wife and child unaware at they start struggling. The mom trying desperately to keep her own head above water as thee tries to keep her son above the surface. What should you watch out? Head bobbing above the surface. Unable to breathe long enough to call for help. Head tilted back, mouth open and the body is vertical. And as a mother of two this was a statistic that irked me the most. Majority of child drownings occur at residential pools so heartbreaking. All right. Reena, thank you so much.
This transcript has been automatically generated and may not be 100% accurate.