German submarine U-670

German submarine U-670 was a Type VIIC U-boat of Nazi Germany's Kriegsmarine during World War II. The submarine was laid down on 25 November 1941 at the Howaldtswerke yard at Hamburg, launched on 15 December 1942, and commissioned on 26 January 1943 under the command of Oberleutnant zur See Guido Hyronimus.

German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-670 had a displacement of 769 tonnes when at the surface and 871 tonnes 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 2,800 to 3,200 metric horsepower for use while surfaced, two Siemens-Schuckert GU 343/38–8 double-acting electric motors producing a total of 750 metric horsepower 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 metres .

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