Abstract: An electrical contractor was installing new equipment at a jobsite. For the preceding week, an electrician who had been working for the contractor for about 6 years had been installing a hydraulic pump. He entered a 7.6-meter deep pit before the shift started to complete the wiring for the pump. About 10 minutes into the shift, he was found unconscious by a coworker. The injured employee's head was bleeding, and his safety glasses were on the floor. He apparently had not been wearing a hard hat. The electrician suffered a blunt head trauma, with a potential concussion. He was hospitalized with loss of consciousness, memory loss, and double vision. A tarp with a corner falling down towards the pit and some 2 by 4s were found covering the opening to the pit. Heavy steel plates had been in place before; but on the morning of the accident, a tarp was used.