A 14-year-old Canadian student tragically drowned during a high school swim class—and wasn’t discovered until 38 minutes later, according to multiple reports.

Blessing Claude Moukoko, an eighth-grader, was taking part in a swim lesson on February 15 at Montreal’s Centre Père-Marquette when he slipped under the water in the deep end of the pool. No one noticed he was missing until after the class ended and his classmates spotted his body at the bottom.

Lifeguards and staff pulled him from the pool and performed CPR before paramedics rushed him to Maisonneuve-Rosemont Hospital. Tragically, he had suffered severe brain damage and could not be revived. Moukoko passed away six days later.

On Monday, a coroner’s report urged schools to rethink how swimming is taught, saying the focus should shift from swim instruction to water safety.

“This just breaks my heart,” said Montreal Mayor Valérie Plante. “I can’t imagine what that teacher is going through. It’s devastating. We need to make sure kids learn how to stay safe in the water—and that schools have the resources they need to protect them.”

The case has sparked calls for major changes in how swim programs are run in schools to prevent another tragedy like this.