Watertight doors left open on an overloaded fishing vessel during a storm likely caused the boat to sink off the coast of Alaska's Aleutian Islands, according to a report released Tuesday by federal investigators.
The Katmai, a 93-foot vessel, sank in October 2008 with a crew of 11 aboard. Four men survived in a life raft, but five others died. Two crew members were never found.
The National Transportation Safety Board's report said the doors from the main deck to the processing space and lazarette allowed water to get in, leading to flooding and sinking. A lazarette is a storage place below deck at the stern of the boat.
The report also faulted the boat's master, citing that his decisions to continue operations as the storm approached and to overload the boat contributed to the accident. The Katmai was carrying about 120,000 pounds of frozen cod, the board said, twice the weight listed in a stability report for the vessel.
The board said another contributing factor was the failure of the vessel's owner to ensure that information given to the master on keeping the boat stable was current and to see that he understood the information and operated the ship accordingly.
NTSB said the boat's last stability analysis was in 1996, and did not account for such things as a change in fishery from shrimp to Pacific cod.
There were no mandatory stability standards that applied to the vessel, NTSB said.
The boat was originally built as a shrimp trawler for the Gulf of Mexico and was later modified. It was owned by Seattle-based Katmai Fisheries Inc., which the NTSB said is no longer in business.
PDF: NTSB report on Katmai sinking 
Video: Coast Guard rescue at sea 
By BECKY BOHRER