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SubmarinesWhat a submarine is:It is an underwater vehicle used mostly for military purpose in the current day and age. Civilian uses mostly for science (marine biology)Cylindrical in shape with conical edges.Bridge structure called Fin in Europe and Sail in America. Houses periscope and stuff.Powered by a propeller or pump jet and has fins on the rear to control the level of the submarine. Along with this also uses ballast tanks which are filled with compressed air to ‘surface’ the craft or filled with water to sink it.Nuclear and Diesel powered: Diesel powered subs require air for the combustion of Diesel engines while nuclear submarines used nuclear energy. This enabled them to remain submerged for a much longer duration under water. Modern-day submarines can stay submerged for over 6 months.HistoryDevelopment started before WWI but accelerated during the war.Leonardo da Vinci had drawings of a submarine but never materialised into a real craft. It was called a ship to sink another ship. He never revealed i