German submarine U-654

German submarine U-654 was a Type VIIC U-boat that was built for Nazi Germany's Kriegsmarine for service during World War II. She was laid down on 1 June 1940 by Howaldtswerke, Hamburg as yard number 803, launched on 3 May 1941 and commissioned on 5 July 1941 under Korvettenkapitän Hans-Joachim Hesse.

Design
German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-654 had a displacement of 769 t when at the surface and 871 t while submerged. She had a total length of 67.10 m, a pressure hull length of 50.50 m, a beam of 6.20 m, a height of 9.60 m, and a draught of 4.74 m. The submarine was powered by two Germaniawerft F46 four-stroke, six-cylinder supercharged diesel engines producing a total of 2800 to 3200 PS for use while surfaced, two Siemens-Schuckert GU 343/38-8 double-acting electric motors producing a total of 750 PS for use while submerged. She had two shafts and two 1.23 m propellers. The boat was capable of operating at depths of up to 230 m.

The submarine had a maximum surface speed of 17.7 kn and a maximum submerged speed of 7.6 kn. When submerged, the boat could operate for 80 nmi at 4 kn; when surfaced, she could travel 8500 nmi at 10 kn. U-654 was fitted with five 53.3 cm torpedo tubes (four fitted at the bow and one at the stern), fourteen torpedoes, one 8.8 cm SK C/35 naval gun, 220 rounds, and a 2 cm C/30 anti-aircraft gun. The boat had a complement of between forty-four and sixty.

Service history
The boat's career began with training at 5th U-boat Flotilla on 5 July 1941, followed by active service on 1 November 1941 as part of the 1st Flotilla for the remainder of her service. In four patrols she sank three merchant ships, for a total of and one warship.

Wolfpacks
U-654 took part in one wolfpack, namely:
 * Zieten (6 – 22 January 1942)

Fate
U-654 was sunk on 22 August 1942 in the Caribbean in position 12°N, -79.93333°W, by the depth charges from a United States Army Air Forces Douglas B-18 Bolo aircraft of the 45th Bombardment Squadron. All hands were lost.