Submarines

submarines are the worrier of the let see how they started and know how advance they become let see now human are very talent full for developing weapon soon realized the need to attack   from under water

this was the world first submarine called the turtle as you can see it has many weakness it was driven manually by a paddle system which put a limit on its movement and had to attach the boom to a ship  by going close to it and got in the way of risk of going near the enemy it was very hard to breath in it because soon the air would run out