Type IIB U-boat of Nazi Germany's Kriegsmarine, built in Germaniawerft, Kiel found. The Turkish navy found a WWII German submarine that sank in the waters of the Black Sea and will showcase its discovery in a new documentary film. According to the television channel Russia Today, the U-23 submarine was found at a depth of 40 meters and about 4 kilometers off the shore of the resort town of Agva, near Istanbul.