RedactedNarrative: The surviving passenger on the vessel described hearing a loud bang, such as a back fire from the engine. He saw what he thought to be smoke or steam coming from the engine compartment. When he opened the compartment he observed water rushing into the boat from where the exhaust manifold blew apart from the boat creating a hole about 5 inches in diameter. This quickly filled the back of the boat with water and caused it to sink, trapping the victim/owner of the boat in the cabin area and taking him down with the boat.