Abstract: At approximately 8:40 p.m. on October 2, 2008, Employees #1 and #2 were working inside a pipe inside an inside an excavation. The employees were employed as experienced pipe layers. The employer was contracted to install pipe for the Naciamento Pipeline Project. According to statements, the employer was provided evidence that a water line existed inside the excavation just prior to the accident and during a walk-through on a previous date. The excavator was stopped temporarily to investigate the existence of the water line and then commenced while the employees were inside the excavation resulting in an excavator rupturing the water line and filling the excavation and pipe where employees were working. Both employees drowned inside the pipe. One coworker escaped the excavation.