Abstract: Employee #1, a maintenance helper at a water amusement park, completed part of his work, then entered a wave pool in water 2.4 meter deep to swim. A coworker, who was cleaning the pool, reminded Employee #1 that he was not allowed to swim in the pool when it was closed. Employee #1 ignored the coworker's warning and stayed in the water and began to swim across the 25-meter-wide pool. When he got about halfway across, he began to go underwater. The coworker's attempts to rescue him were unsuccessful, and Employee #1 drowned. He had held the job for about 1 month. All employees were told when hired that swimming was not allowed when pools were closed and the lifeguards were not present, and each employee knew the rule.