Diving on a WW1 German Submarine U-89 off Coast of Ireland February 2, 2019 Unipro2013main Wartime Shipwrecks, WW1, WW1 Naval History U-89 The German U-boat U89 was on active service during WW1 in the Atlantic Ocean off the coast of Ireland. When on 12th February 1918 she was rammed and sunk by HMS Roxburgh with a loss of all her crew. Depth 60m.