National Geographic Daily News  U.S.S. President Coolidge
Photograph by David Doubilet, National Geographic  Divers swim
near a guntub on the sunken U.S.S. President Coolidge near
Vanuatu's Espiritu Santo Island. Built in 1931 as a luxury
cruise liner, the Coolidge was converted to military use during
World War II. It sank in 1942 after inadvertently striking an
American mine while approaching Espiritu Santo.