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Whale plus metal equals submarine!
The hull is the outer shell or the metal skin of the submarine that protects the inner area from the outside water.
Wood was used to make the first submarine
A submarine is only used under water.
they were used in wars
The submarine is under water.
Because they need to be able to withstand the pressure of the seawater outside. The deeper a submarine goes - the higher the pressure gets.
this Submarine can not break of water pressure because it is made of the hardest metal in the world!
A submarine was used to monitor enemy activity and then to attack by using large torpedoes.
David Bushnell's Turtle (Revolutionary War) was made of oak, heavily covered in pitch to make it waterproof, and reinforced with metal bands.
The object used to view the outside from inside the submarine is called a periscope.
The Turtle was made mostly of wood, with a few metal parts.