The USS F-1 (ex-CARP) (SS 20) sunk on 17 DEC 1917 with the loss of nineteen officers and men after a collision with the USS F-3 (ex-PICKEREL) (SS-22)) off San Clemente, CA.
While maneuvering in exercises at sea, F-1 and F-3 collided, the former sinking in 10 seconds, her port side torn forward of the engine room.
Nineteen of her men were lost, while 3 others were rescued by the submarines with whom she was operating.