Uncompleted U-boat projects
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During World War II, Nazi Germany's Kriegsmarine considered various submarine designs for specialized operations or improving U-boat performance. Many of these designs did not come to fruition for various reasons; some were abandoned due to practical considerations, while others towards the end of the war had to be abandoned as the yards where they were being built were overrun by allied forces.
List of projects cancelled or not put in production
Type III U-boat - was a 1934 project for a purpose-built minelayer based on the Type IA U-boat. The Type III U-boat would have been similar to the Type IA, but with a hull lengthened by 7.5 m, and a total displacement of 970 tons. The Type III U-boat was planned to carry an armament of 54 to 75 mines (depending on the type carried), two 105-mm deck guns, and one 20-mm antiaircraft gun.
Type IIIA U-boat - originally known as Type VII, was a planned minelayer similar to the Type IA U-boat. It would have had a larger outer hull than the Type IA, and featured a large, watertight cylindrical hangar on the aft deck, which would have carried two small motor torpedo boats. The boat would have carried 48 mines, and used the smaller boats to help lay and recover mines. The project was dropped as impractical.
Type IV U-boat - was a planned resupply and repair U-boat, intended to meet other U-boats at sea and resupply them with torpedoes, fuel, food/water, and spare parts (similar in concept to the later Type XIV), and also be capable of performing light repair work.
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