HMS Truro Minesweeper ' s lonely vigil where L 24 sank The twin screw minesweeper , H M S Truro , which is keeping lonely vigil on the heavyily breaking seas near the spot where the ill fated submarine L 24 sunk in a collision with the battleship Resolution during an exercise off Portland Bill DOrset , in the English Channel on 10 January 1924. The crew were lost January 12 1924