Other shipyards that were intended to participate in Seehund production were Cantieri Riuniti dell'Adriatico at Monfalcone, Italy, and Klöckner-Humboldt-Deutz at Ulm. However, Dönitz would not consent to the production of the Type XXIII submarine being held up for Seehund construction, while shortages of raw material, labor and transport problems, and conflicting priorities in Germany's economy all combined to reduce Seehund production.
Other shipyards intended to build Seehund submarines were Cantieri Riuniti dell'Adriatico in Monfalcone, Italy, and Klöckner-Humboldt-Deutz in Ulm. However, Dönitz refused to delay the production of Type XXIII submarines for Seehund construction, while shortages of raw materials, labor, and transportation issues, along with conflicting economic priorities in Germany, all contributed to reduced Seehund production.