On 11 September 1940, Gato-class submarine
USS Drum SS-228
was laid down at portsmouth Naval Shipyard, Kittery, ME. The Grayling (SS-209) is shown inside the old erection shed at Portsmouth just before her launching on 4 September 1940. The more leisurely building schedules prior to the war permitted the boats to be brought to an advanced stage of construction before they were launched.
The Drum (SS-228) is under construction on the adjacent ways to the left.