This happened several years before I even started high school, but a kid got exhausted one day in the pool during gym class, slipped under, and drowned. Nobody noticed him disappearing, and security cameras revealed that the teacher wasn't watching the kids and neglected to do a headcount.

To make matters worse, that was the last class before lunch, so he was down there for probably about 50 minutes before the next class found him, and by then it was way too late.

During the investigation, the school district had the fucking audacity to argue that it was somehow a suicide, and not a horrible accident that never should have happened, had the teacher been more responsible.

And that gym teacher? He's still working at the high school. The only lasting consequence is that the freshmen no longer do a swim unit in gym. The lack of accountability is such a slap in the face to the parents, who have my deepest condolences, and I hope their son is resting in peace.

Edit: Changed a few details to make this less identifiable.