American coastal submarines to be built by five separate shipyards according to the Dutch magazine Marineblad 1916/1916 no. 5

An item referred to the Proceedings dealing with the spreading of the 16 coastal submarines to be built, building costs each submarine around 545.000 US dollars. Electric Boat Company (8), Lake Torpedoboat Company (3), California Shipbuilding Company (3, Lake design), Navy Yard Portsmouth (1, E.B.C. design) and the Navy Yard Puget Sound (1, E.B.C. design).