RedactedNarrative: V1 was stationary alongside a bridge piling on Harney Pond Canal under Hwy 78 bridge. Both occupants attempted to secure the vessel to a bridge piling off the port side of vessel. Both occupants were standing on the port side of vessel. V1 Owner Operator’s left foot broke through the lid of the port side compartment causing V1 to list to the port side. This action caused both occupants to fall overboard of the port side. foot and leg remained in the compartment and he managed to pull himself back into V1. The other occupant was struggling to swim. operator reached for but was about three feet from occupant’s hand as he disappeared under the water surface.; Victim could not swim and was heavely clothed. He struggled and went under water and drowned.