Where were U-boats made?

Answer 1

Unterseeboots (U-boots, Anglicized to U-boats), those used in WW1 and WW2, were originally built in the shipyard owned by Krupp in Kiel, Germany. The first U-boat was the three-man sub Brandtaucher, built also in Kiel by the ship builders Schweffel & Howaldt in 1850. It sank during its first test dive in 1851 in Kiel Harbor, but was raised and placed in the Bundeswehr Military Museum in Dresden in 1887. Krupp built the Karp Class U-boats that were sold to the Russian navy for the Russo-Japanese war in 1904. Other U-Boat builders and the number of boats they built follow:

AG Weser, Bremen 162, Blohm & Voss, Hamburg 224, Bremer Vulkan-Vegesacker Werft, Bremen-Vegesack 74, Danziger Werft AG, Danzig 42, Deutsche Schiff und Maschinenbau AG, Bremen 16, Deutsche Werft AG, Hamburg 113, Deutsche Werke AG, Kiel 69, F. Schichau GmbH, Danzig 94, F. Krupp Germaniawerft AG, Kiel 131, Flender Werke AG, Lübeck 42, Flensburger Schiffsbau-Ges, Flensburg 28, H.C. Stülcken Sohn, Hamburg 24, Howaldtswerke AG, Kiel 31, Howaldtswerke Hamburg AG, Hamburg 33, Kriegsmarinewerft (KMW), Wilhelmshaven 27, Neptun Werft AG, Rostock 10, Nordseewerke, Emden 30, Oderwerke AG, Stettin 2, Stettiner Maschinenbau AG, Stettin 1.

Germany was not the only U-boat builder however. Swedish Thorsten Nordenfeldt built four: Nordenfeldt I, built at Stokholm Harbor by Bolinders--delivered to Salamis Naval Base in 1887 for the Hellenic Navy, it never saw combat; Nordenfeldt II (Abdülhamid, 1886) and Nordenfeldt III(Abdülmecid, 1887) for the Ottoman Navy, both were built in stages at Des Vignes, Chertsey, Surrey, England and Vickers, Sheffield, England, and assembled at Taşkızak Naval Shipyard in Istanbul, Turkey. Incidentally, Abdülhamid was the firstsubmarine to fire a torpedo while submerged. A fourth hull was built for the Russians in 1887, Nordenfeldt IV, but was scrapped when Russia refused to pay for the boat after it ran aground off Jutland.