U.S.S. Grayback
The submarine that the researchers and technicians were searching for was the U.S.S. Grayback, or S.S. – 208. The operation was carried out on behalf of the Lost 52 Project, dedicated to locating the 52 U.S. submarines that disappeared during the Second World War. The Grayback was reported as missing by the U.S. Navy in late March, 1944.
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On January 28, 1944, the Grayback had set out from Pearl Harbor on a combat patrol. This was the submarine’s tenth mission. It would, sadly, end up being her last. The submarine did have some success before its imminent disappearance, it managed to sink the Japanese freighters, Toshin Maru and Taikei Maru, and hit two others. We know this because the sub sent a message back to base on February 24 reporting this.