The Seehund was the most successful midget submarine in the German Navy and between January 1945 to April 1945, 142 sorties had been conducted which resulted in the sinking of 8 ships (17,301 tons) with a loss of 35 in return. It is believed the majority of losses were caused by calamities rather than due to enemy action. Three ships were damaged for 18,384 tons.

Technical data:
- dimensions - 50 x 35 mm
- number of details - 3