A group of teenagers snuck into the pool of a Pennsylvania swim club after hours, but none of them could swim, resulting in a terrible tragedy.

When a 13-year-old went to the bottom of the deep end, the others fled leaving him to drown, police said.

Like 6 ABC reports, it happened at the Folcroft Swim Club in Delaware County early Wednesday.

Folcroft Police Chief William Bair tells 6ABC that four boys between the ages of 13 and 15 snuck into the pool just after midnight.

What happened next was deadly. here are the 6ABC details:

The 15-year-old was in the deep end, floating on a raft. It was then that the 13-year-old victim decided to jump from the high dive.

But instead of landing on the raft, the boy dived to the bottom.

And it turns out that none of the boys could swim very well – if at all, according to the police.

So the rest of the boys just ran away, leaving their friend to drown, the chief said.

In fact, the boys were well along in their escape before the 15-year-old finally decided to call 911 to get help for the friend. But the boy gave the dispatcher the wrong pool, according to the chief.

Officers were directed to the Briarcliffe Swim Club nearly two miles away, writes 6ABC, adding: By the time police and paramedics realized they had to be in Folcroft, nearly 30 minutes had passed.

And it was far too late for the 13-year-old, who has not been publicly identified in the story.

Regarding the charges in the case, the chief tells 6ABC that the pool club likely won’t be held negligent for children who jump in through the basketball court gate.

“You can lift that door and kind of turn it, and for a skinny miner it’s easy to get in,” the chef told 6ABC.

As for the other boys, police said they would turn the investigation over to the county attorney’s office to determine prosecution, if any.

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