Abstract: On February 17, 1988, maintenance workers were modifying a cooling tower platform preparing for the installation of a new cooling unit. Removal of the old unit left floor openings. Maintenance workers were preparing to enlarge the opening for the larger new unit. Employee #1 was explaining to three other workers which areas needed to be changed to accommodate the new unit. When he turned, he stepped into a 22 in. by 37 in. floor hole. As he went through the opening, he partially caught himself, altering his fall path from straight down to falling at an angle. His feet caught the top of a chain link fence gate, causing his head and shoulders to strike the roadway first. Employee #1 died of his injuries.