The SS President Coolidge was a luxury ocean liner built in 1931, originally designed for the American President Lines. It was named after the 30th President of the United States, Calvin Coolidge, and was primarily used for passenger travel between the United States and the South Pacific. During World War II, the ship was repurposed as a troop transport. In October 1942, while anchored in Espiritu Santo, it struck a mine and sank, becoming one of the largest wrecks in the world. Today, the SS President Coolidge is a popular dive site, attracting divers interested in exploring its underwater remains.