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A teenager is being hailed a hero after saving a young pool-goer from a near-drowning on his first day on the job as a lifeguard.

Jack Viglianco, 15, told WJW that his instincts took over when he noticed a 4-year-old boy struggling in the Charles A Foster pool in Lakewood, Ohio on Thursday.

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“I heard like a ‘Help! Ah!’ kind of thing and I looked over and I saw a guy who’s probably like 3 feet 6 inches, the the 4-foot water and gasping for air,” said Viglianco.

According to WJW, the boy was visiting the pool with his summer camp. Luckily, Viglianco had just finished his training as a lifeguard the day before.

“I was realizing that I just saved a kid’s life. And that is something not many other people can say. Nothing my friends have ever said,” said Viglianco.