His Majesty's Submarine Unbeaten was last heard from via a signal sent to Flag Officer Submarines on November 1, 1942. The signal simply stated: "Operation Bluestone completed". After this date the 58-meter British U-Class submarine inexplicably disappeared. Unbeaten was fully operational for just over two years. During its short tenure, Unbeaten successfully returned to war-torn Malta many times, symbolically flying its Jolly Roger.
"an ok story, not terribly exciting"