[1] Timm also took part in "Operation Wunderland" in the Kara Sea, surfacing close to Uyedineniya Island and destroying a Soviet weather station with cannon fire from his deck gun.

When the U-251 was decommissioned to be overhauled in June 1943, Timm and his crew were sent to take over the new Type IXD2 U-boat U-862, and after training missions in the Baltic Sea, they sailed her to the Indian Ocean during mid-1944 to join the Monsun Gruppe of U-boats prowling in the Indian Ocean and farther east, from Japanese-held naval bases.

Then, while patrolling off eastern Australia in late 1944 and early 1945, Timm sank two American Liberty ship merchantmen.

[1] This later gave rise to the widely circulated post-war "tall tale" that Timm led members of his crew ashore near Napier in order to milk some cows to supplement their meagre rations.

The German seamen were taken into custody by the British, and they were taken to Great Britain during July 1946, and then still held prisoner, even though Nazi Germany had surrendered over a year earlier.