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German Type XVIIB submarine
The Type XVIIB U-boats were small experimental coastal submarines constructed to test the Hellmuth Walter's high-test peroxide propulsion system, which offered a combination of air-independent propulsion and high submerged speeds. Three boats of this type were built by Blohm + Voss of Hamburg between 1943 and 1944: U-459, U-461, and U-463.
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