A contractor inspecting the seals inside a large gasoline storage tank did not make it out alive. He was overcome by the toxic vapors in the tank and unable to escape or call for help. His partner was stationed outside the tank awaiting his return. It was arranged that the system of communication would involve tapping with a rock on the inner or outer wall of the tank. The only safety equipment the team had was the self-contained breathing apparatus (SCBA) worn by the victim, and an unused safety line left outside the tank. Investigation indicated the victim had not been wearing […]