A '''submarine''' is a vehicle that travels under water (i.e. an underwater boat). The submarine was invented in the 17th century. Though it was originally designed for the purpose of exploration, its military benefits soon became clear. The first military submarine was the Turtle which was used by the Colonists during the [[American Revolution]], although without success. | A '''submarine''' is a vehicle that travels under water (i.e. an underwater boat). The submarine was invented in the 17th century. Though it was originally designed for the purpose of exploration, its military benefits soon became clear. The first military submarine was the Turtle which was used by the Colonists during the [[American Revolution]], although without success. |