''Hai'' (shark) was an advanced model of the Marder-class

midget submarine A midget submarine is any submarine under 150 tons, typically operated by a crew of one or two but sometimes up to six or nine, with little or no on-board living accommodation. They normally work with mother ships, from which they are launched an ...

s created in

Nazi Germany Nazi Germany, officially known as the German Reich and later the Greater German Reich, was the German Reich, German state between 1933 and 1945, when Adolf Hitler and the Nazi Party controlled the country, transforming it into a Totalit ...

during

World War II World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...

and operated by the K-Verband. Its prototype performed poorly during test runs and therefore no other boats were produced. The ''Hai'' was long and its length allowed for larger batteries, giving it the maximum speed of under water. In addition, the ''Hai'' could remain under water for up to two hours.

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