A midget submarine has a displacement of less than 150 tons, with less than 8 crew and no boarding facilities. The midget submarine operates in conjunction with a mother ship. The Japan Navy built 800 of these classified into 7 classes. They were to

The K141 Kursk was Oscar II class nuclear powered submarine with cruise missiles in the Russian Navy. It sunk in the Barents Sea in 2000. The Oscar II name is the NATO classification. The K141 Kursk was commissioned in 1994. It was 154m long and four