A Canadian teen tragically drowned and spent an unbelievable 38 minutes underwater during a regular high school swim class.

The heartbreaking incident occurred before anyone in the facility even realized that he was lying motionless at the bottom of the pool.

The official coroner’s investigation released on Monday urgently urged schools to completely overhaul their swimming instruction programs.

This urgent warning follows the devastating death of 14-year-old Blessing Claude Moukoko last February, the Montreal Gazette reported.

The young eighth-grader was partaking in scheduled swimming lessons on Feb. 15 at Montreal’s Centre Père-Marquette.

During the active session, he apparently went under and drowned in the deep end of the crowded pool.

Classmates shocked the entire facility when they spotted his submerged, still body after the physical education class had officially ended.

However, just as the physical education teacher ran toward the deep end, the school’s security administrator pulled the digital timestamp from the overhead safety cameras. What the unedited footage actually revealed about the exact movement of a second person near the emergency pool-drain valve just three minutes before Blessing slipped under the surface completely shocked investigators…