At the end of the First World War, the whole German High Seas fleet was interned at Scapa Flow, a British navy base in the Orkney islands north of Scotland. On 21 July 1919, Admiral Ludwig von Reuter decided that the ships should not be seized by Britain. He sent the order to sink the vessels. 74 ships went down that afternoon in the biggest mass-scutling in history. Most of the vessels have now been salvaged, but some battleships can still be visited, such as the 24,000-tonnes Kronprinz Wilhelm and Markgraf. Several light cruisers (5,000 tonnes) like the Desden, Brummer, Karlsruhe and Coln also offer very interesting dives.