In 1940, Oklahoma's base was shifted from the U.S. west coast to Pearl Harbor, Hawaii. She was at Pearl Harbor when the Japanese attacked on 7 December 1941. Moored outboard of USS Maryland (BB-46), she was hit by a great number of Japanese Type 91 aerial torpedoes. With her port side torn open over much of its length, Oklahoma rapidly rolled over and sank to the harbor bottom, with the loss of over 400 of her crew. Many of the men trapped in her upturned hull were cut free through the intense efforts of Sailors and civilian Navy Yard employees. During 1943, Oklahoma was the subject of a massive salvage undertaking, involving turning her upright, patching her damages and refloating her. She was drydocked late in the year to be stripped of guns and other equipment and repaired sufficiently to make her relatively watertight. Too old and badly damaged to be worth returning to service, Oklahoma was formally decommissioned in September 1944. She was sold for scrapping in December 1946, but sank while under tow from Hawaii to California in May 1947. USN Ships--USS Oklahoma (BB-37) Many people have debated Pearl Harbor and are aware of the USS Arizona and the memorial that exists there today that honors the sailors that perished aboard her. Not many are aware of the story of the USS Oklahoma and when it rolled over, trapping hundreds below decks and the massive salvage operation that eventually righted the ship.