Warship at the bottom of the sea.

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Submarines are warship designed to cruise and fight from the bottom of the sea and they first appeared during World War I. After World War II, submarines revolutionized naval warfare with the abilty to stay submerged for indefinite periods.

David Bushnell, built the first fighting underwater craft between the year 1775 and 1776.

Seawolf and Seadragon were two of the famous submarines cruising the oceans more than five decades ago. Then underwater crafts performances stole the interest of many worldwide and a popular TV show attracted huge audiences. The TV show is called, "Voyage to the bottom of the sea".