In January 1945 an attempt was made to mount an attack on Vaenga Bay in the Kola Inlet.[13] The hope was either to attack one of the convoys that stopped there to refuel and take on ammunition or to attack the Soviet battleship Arkhangelsk (HMS Royal Sovereign on loan to the USSR).[13] As it happened neither the battleship nor a convoy were in the port at the time of the planned attack.[13] The plan was for U-boats to carry the Bibers within range of the harbour.[13] U-295, U-318 and U-716 set off from Harstad on 5 January with Bibers mounted on their casings.[13] Vibrations from the U-boats’ engines caused the Bibers stern glands to leak allowing water to reach the machinery space and as a result the mission was abandoned.[13]