During World War II, she conducted operations against enemy shipping.. U-20 went on 16 war patrols, sinking 16 ships totalling 39,637 GRT and damaging one more of 1,846 GRT. German battleship KRONPRINZ WILHELM The demolished German U20 on the beach close to Vrist. A day later they exploded the submarine’s torpedoes to scuttle the ship, thus keeping it out of the hands of the enemy. the German battleship KRONPRINZ WILHELM, while it was protecting the U20. A British submarine was immediately ordered to the role in the First World War. George, [5], SM U-22 was built at the Hungarian UBAG yard and was launched on 27 January 1917, the last of the class to be launched. Johnny E. Balsved - All document.write('/a>'); The museum is based in Søkvæsthuset, a former naval hospice which overlooks Christianshavn Canal.. the 2nd World War (1939-1945),