U.S.S. Conestoga (#) (1904-1921), 170-foot U.S. Navy tugboat disappeared with 56 cre aboard while en route from Mare Island to American Samoa, by way of Pearl Harbor in 1921.
On March 23, 2016, NOAA's Office of National Marine Sanctuaries (ONMS) and the U.S. Navy announced the discovery of the wreck of USS Conestoga within the waters of Greater Farallones National Marine Sanctuary in California. The discovery by the ONMS Maritime Heritage Program solves a 95 year-old mystery. Conestoga sailed from San Francisco Bay on March 25, 1921 and vanished with 56 men. Until now, what happened, and where the wreck and its crew lay, has been described as one of the top maritime mysteries in U.S Navy history. Conestoga's final resting place in Greater Farallones sanctuary is federally protected under the National Marine Sanctuaries Act and the Sunken Military Craft Act.