Abstract: Two employees were at a manhole at a new installation that had not been put into service. The employees were there to repair leaks in manhole. Employee #1 put a ladder in the manhole and climbed in. Employee #2 stayed at the top and was organizing tools to be handed down as needed. Employee #2 looked into the manhole to check on Employee #1 and saw that Employee #1 was lying down and thought he had fallen and hit his head. Employee #2 for emergency assistance and went down the ladder into the manhole to help Employee #1. Employee #2 was overcome with the vapors and passed out momentarily. Employee #2 regained consciousness and was able to climb out of the manhole. The rescue personnel arrived and removed Employee #1 from the manhole and transported him to the hospital, where he died two days later. Employee #2 was hospitalized.