3. SS President Coolidge, Vanuatu
This was once an extravagant luxury ocean liner that did its part for the war effort and was recommissioned to carry troops in 1941. She was pulling into Espiritu Santo harbor when she hit some mines. Thankfully, all but two men survived by swimming to shore, but the ship was lost to the bottom of the sea. Today, it’s one of the top wreck dives in the world, famed for both its easy beach access and its visibility.