NTSB Releases Final Report on Subí Collision
The National Transportation Safety
Board today released its final report on its investigation into the collision
between a U.S. Navy
submarine, the USS Greeneville
, and a Japanese motor
vessel, the Ehime Maru
The collision resulted in the sinking of the Japanese vessel and the deaths of 9 of her crew
occurred February 9, 2001, off the coast of Hawaii
, when the submarine struck the motor
vessel while performing an emergency
surfacing maneuver during a demonstration cruise
as part of the Navy's Distinguished Visitors Program. The Japanese fishing
and training vessel was in the middle of a 74-day training voyage.
Board determined the probable cause of the accident
to be the inadequate interaction and communication among senior members of the combat systems team on the submarine, which resulted in the failure to perform adequate contact analysis, to adhere to proper procedures for moving to periscope depth
; and the commanding officer's decision to order an emergency
Contributing to the cause of the accident, the Board found, was the failure of the crew, in particular the commanding officer, to adequately manage the civilian visitors so that they did not impede operations.
Contributing to the loss of life was the rapid flooding and sinking of the Ehime Maru, which occurred when the submarine's rudder
tore through the fishing
vessel's lower deck
The NTSB's report is available on its website at: www.ntsb.gov
under "Publications", "Marine."
It describes the Board's factual findings and analysis, as well as corrective actions taken by the Navy
since the accident.