In the spring of 1944 a special committee decided that a U-Bootbunkerwerft (shipyardbunker) should be build for the production of the hullsections 3, 5 en 6 of the U-Boot type XXI. This bunker was given the codename "Hornisse". It was build in the harbor in Bremen, by a company called Wayss & Freytag.
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On 30-03-45 the bunker was bombed by the American 8th Air force. It was hit several times.
Because of the end of the war, the bunker wasn't finished. It was never used for production. Today the bunker is used as a foundation for an office building.