Type IXB submarine

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The Type IXB submarine was a sub-class of the Type IX submarine built for Nazi Germany's Kriegsmarine between 1938 and 1940. The U-boats themselves were designed to be fairly large ocean-going submarines. The inspiration for the Type IXB submarine came from the earlier original Type IX submarine, the Type IXA submarine. The design was developed to give an increased range, a change which resulted in a slightly heavier overall tonnage. This design was improved even further in the later Type IXC submarines. The class comprised 14 submarines, U-64, U-65, U-103, U-104, U-105, U-106, U-107, U-108, U-109, U-110, U-111, U-122, U-123, and U-124. Twelve were sunk during the war and two scuttled by their crews at the end of the war. The Type IXB was the most successful class of submarine in the war in terms of average tonnage sunk, with each U-boat sinking an average of over 100,000 gross register tons (GRT) during its career.