The evolution of underwater warfare : General characteristics and ships of the B-Class Submarines
Serving in the Philippines from 1912 to 1915 were the B-class submarines built by Fore River Shipbuilding for the U.S. Navy. At 82.5 feet in length, with a maximum speed of 9 knots, and two bow torpedo tubes, these submarines were efficient despite their small size. They were decommissioned between 1919 and 1922 and used as targets again.