On March 25, 1921, three years after the end of World War I, the USS Conestoga left Mare Island, California bound for American Samoa. It was never heard from again.

For nearly a century, what happened and where the Conestoga and its 56 crew members came to rest remained a mystery. But now, with the discovery of a shipwrecked fleet tug in Greater Farallones National Marine Sanctuary, we’ve solved this mystery: the Conestoga sank just three miles off Southeast Farallon Island within a day of leaving port.
Solving a Century-Old Riddle: Discovering the Wreck of the USS Conestoga | Office of National Marine Sanctuaries

Sigh… Those poor men.