German submarine U-635

German submarine U-635 was a Type VIIC U-boat built for Nazi Germany's Kriegsmarine for service during World War II. She was laid down on 3 October 1941 by Blohm & Voss, Hamburg as yard number 611, launched on 24 June 1942 and commissioned on 13 August 1942 under Oberleutnant zur See Heinz Eckelmann.

Service History
The boat's career began with training at 5th U-boat Flotilla on 13 August 1942, followed by active service on 1 April 1943 as part of the 1st Flotilla for the remainder of her very short service.

In one patrol she damaged two merchant ships, for a total of.

Convoy HX 231
In April 1943, U-635 joined the wolfpack Löwenherz and attacked the Eastbound convoy HX 231 bound for Liverpool from Halifax, Nova Scotia.

At 22:15 on 4 April, U-635’s torpedoes struck the lead ship of the column, the British freighter Shillong. GS U-630 delivered the coup de grâce. She took only 12 minutes to sink.

The next target was the British refrigerated ship Waroonga, carrying much needed butter and cheese from New Zealand for the war-weary British population. She was hit with 2 torpedoes, but stayed afloat thanks to the integrity of her watertight bulkheads. However, it wasn’t to last as she too was despatched by GS U-630 the following day.

Wolfpacks
U-635 took part in one wolfpack, namely
 * Löwenherz (1–5 April 1943)

Fate
U-635 was sunk on 5 April 1943 in the North Atlantic in position 58.33333°N, -31.86667°W, by depth charges from RAF Liberator of 120 Squadron. All hands were lost.