'Ghost Ship of the Pacific,' which fought on both sides in WWII, discovered near San Francisco

Searchers have located the wreck of the only warship that fought for both the United States and its enemy Japan during World War II.

The remains of the destroyer USS Stewart were found in early August at a depth of roughly 3,500 feet (1,065 meters) in the Cordell Bank National Marine Sanctuary, about 50 miles (80 kilometers) northwest of San Francisco.

It was sunk there during target practice in 1946 by rockets from U.S. warplanes and shells from a U.S. warship. But its exact location was unknown, until the wreck was rediscovered by three autonomous underwater vehicles (AUVs) deployed by the marine robotics company Ocean Infinity.

According to The New York Times, the AUVs searched a 37-square-nautical-mile (49 square miles, or 127 square km) area of the seafloor in under 24 hours.

"We covered it very quickly, and in high resolution," Andy Sherrell, Ocean Infinity's director of maritime operations, told the newspaper.

Related: 30 incredible sunken wrecks from WWI and WWII

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On both sides

The Stewart started the war as a U.S. destroyer designated DD-224 and was ordered to Borneo in November 1941, shortly before the U.S. entered World War II. It served as an escort vessel with other American warships in the first months of the Pacific War, but it was badly damaged by gunfire from Japanese warships near Bali in February 1942, during the Battle of Badung Strait.