Each submarine had four 3,000 horsepower (2.2 MW) engines and fuel enough to go around the world one-and-a-half times, mr 400 feet (120 m) long, three times the size of the average contemporary submarine.
Each submarine had four 3,000 horsepower (2.2 MW) engines and fuel enough to go around the world one-and-a-half times, more than enough to reach the United States from either direction. It displaced 6,500 tons and was over 400 feet (120 m) long, three times the size of the average contemporary submarine.