''This is a prototype, submarine oxygen torpedo with the FaT guidance system which uses a gyroscopic mechanism to change course overtime that was developed from another (Germany) country for use on surface attacks on enemy warships. This prototype oxygen torpedo was brought by U-boats for practical use on sea-lane control. | ''This is a prototype, submarine oxygen torpedo with the FaT guidance system which uses a gyroscopic mechanism to change course overtime that was developed from another (Germany) country for use on surface attacks on enemy warships. This prototype oxygen torpedo was brought by U-boats for practical use on sea-lane control. |