f-1

Updated: May 15, 2025

In the United States Navy boats to be accepted must stand a pressure equivalent to that encountered at 200 feet. In the German navy the depth prescribed is 170 feet. Under normal conditions submarines seldom travel at a depth of more than 100 feet although the "F-1" of the United States Navy accomplished the remarkable feat of making a six-hour cruise in San Francisco Bay at a depth of 283 feet.

Willis J. (Willis John) Abbot - Aircraft and Submarines: The Story of the Invention, Development, and Present-Day: Uses of War's Newest Weapons