Type: XXI Construction Laid Down: October 3, 1944 Launched: December 3, 1944 Commissioned: January 14, 1945 Shipyard: Schichau-Werke, Danzig Commander Günther Keller Fate: Scuttled at Travemünde near Neustadt, May 2, 1945 U-boat.net webpage for U-3521