Abstract: Employee #1 was in an unshored trench that was 6 ft deep, 8 ft long, and 4 ft wide and was receiving water from a leaking water main. He was preparing the water main for repairs when a section of the trench wall fell on him. During rescue attempts, more of the wall kept falling into the trench. During one of those falls, Employee #2 sprained his lower back. Both employees were taken to the hospital. Employee #1, who had broken and crushed bones in his right knee and had dislocated his left knee, damaging tendons, ligaments, and other soft tissues, required surgery to both knees. Employee #2 was treated and given 24 hours bed rest.