Why did the fish swim, so invented the submarine?
As a new weapon, the submarine appears different from the ship, and it has undergone a tortuous course. If it were not for war and blood, submarines would not have been invented too soon. The idea that man would make an underwater vehicle had been born long ago. In 1620, the Dutch de Rebel invented and built the first submarine in the world. He successfully dived underwater for four to five meters during the trial on the British Thai river.
Because the fish's air intake and exhaust can control the ups and downs of the fish, the submarine is invented according to this principle.
Later, American David Verhunel also built a ship for submarine combat use, named "sea turtles", only by a person, is entirely made of wood, it uses human shaking propeller propulsion crank. In 1776, Ezra Lee, a sailor from the United States, sailed the turtle submarine near British ships moored at New York harbor. The ship was not injured because Ezra could not fix it in the bottom of the ship but exploded on the surface near the British ship. In the history of submarine in the world, the earliest push the submarine into actual combat, I am afraid to count the British Johnphilip Holland. The submarine was officially used in naval warfare for the first time in World War i.. In September 1914, German and British naval battles took place near the Danish coast. The German submarine U-9, sank the British "Yaboke" and "cresset" and "Hoge" three cruisers. At that time, Holland only died more than a month, the German is based on Holland's submarine structure and principles, the construction of the world shocked submarine ships.
