HNoMS Ula, previously HMS Varne, a British-built U-class submarine, and a member of the third group of that class to be built.

The Dutch crew (mainly 34 from the decommissioned submarines KIX, KX and KXII) needed to be brought to the UK from Sydney via Cape Town.

Their ship from Cape Town was the merchant vessel Abosso, which was unescorted and was attacked and sunk in the Atlantic, 48.30N 28.50W, by the German U Boat Type VIIc U-575 on the night of 29 October 1942.

She carried out 14 patrols during World War II, operating as part of the 'Norwegian Section' of the 9th Submarine Flotilla at Dundee.

On 19 April 1944, under CO Lt Valvatne RNoN, 1 kilometre (0.62 mi) south east of Løten on the western Boknafjorden, near Stavanger, Norway, the submarine fired a salvo of four torpedoes.