SS Idaho was a 10,000-ton Texaco T2 type tanker ship, original named SS Dirigo built by the Texas Steamship Company of Bath, Maine, launched on 9 November 1918 and completed in February of 1919. In 1940 she was renamed the SS Idaho. SS Idaho was attacked by the Japanese submarine I-21 off the coast of California on 23 December 1941. Sub I-21, captain Matsumura, surfaced and used his deck guns to attack the SS Idaho 18 miles off the coast of the small town of Cambria, California, but the 10,000-ton Texaco tanker escaped with minimal damage. A few hour earlier on 23 December, the submarine I-21 torpedoed the tanker SS Montebello, in the same spot off the coast of northern California, and then proceeded to machine-gun the survivors in the water. All of Montebello's 38 crew members survived the atrocity. After the war the Idaho was scrapped in 1947.