It is indeed.
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.
A submarine was used to monitor enemy activity and then to attack by using large torpedoes.
The object used to view the outside from inside the submarine is called a periscope.
1776
This is an old and a common term. The torpedo has been used since the first submarine's were used in war time.
it was Germany.
submarine
Submarine - A ship designed to travel underwater used for exploration and warfare. Submarine - A sandwich that is shaped like the submarine ship, also known as a grinder or hoagie.