When was the first submarine invented in the world?

Submarines were built and tested between 1620 and 1624.

The first submarine in the world was invented by Dutch inventor Dick Nillies Draber. This submarine is made of wood and covered with an oiled cowhide diving boat. Carrying 12 sailors, equipped with sheepskin as water tank. When diving, the sheepskin is filled with water; When floating, the moisture in the sheepskin is squeezed out; When sailing, the wooden oars are paddled by manpower.

The first attack mission of submarine was during the American Civil War in 1776. David bushnell of the United States invented a submarine named "Turtle".

The submarine "turtle" is shaped like a goose egg, with its tip facing down. It can only hold one person. There is a water tank, a water pump and a hand propeller at the bottom of the submarine. There is also an explosive barrel hanging outside the submarine. During the war, the U.S. military ordered an army sergeant to sneak attack on the British warship "Eagle" anchored in new york Harbor.