On 5 May 1945, the U-534 was 2 nautical miles north of the 56th parallel, and Nollau decided to form a convoy with two Type XXI U-boats, the GS U-3523 2 and GS U-3503 2 , and continue sailing north on the surface of the Kattegat sea in an area too shallow for crash diving, when two British RAF Liberator aircraft attacked (G/86 George from Tain and E/547 Edward from Leuchars).