''Hai'' (shark) was an advanced model of the

Marder Marder may refer to: German military vehicles * A series of World War II tank destroyers: ** Marder I ** Marder II ** Marder III * Marder (IFV), a modern infantry fighting vehicle * Marder (submarine), a World War II midget submarine People with ...

-class

midget submarine A midget submarine (also called a mini 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, ...

s created in

Nazi Germany Nazi Germany (lit. "National Socialist State"), ' (lit. "Nazi State") for short; also ' (lit. "National Socialist Germany") (officially known as the German Reich from 1933 until 1943, and the Greater German Reich from 1943 to 1945) was ...

during

World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposin ...

and operated by the

K-Verband The K-Verband (in English "small battle unit", derived from ''Kleinkampfverbände der Kriegsmarine'' "small battle units") was a World War II German naval unit that operated a mixture of midget submarine A midget submarine (also called a mini sub ...

. 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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