USS G-3 (SS-31) was a G-class submarine of the United States Navy. While the four G-boats were nominally all of a class, they differed enough in significant details that they are sometimes considered to be four unique boats, each in a class by herself. G-3 was named Turbot when her keel was laid down on 30 March 1911 by the Lake Torpedo Boat Company in Bridgeport, Connecticut, making her the first ship of the United States Navy to be named for the turbot, a large, brown and white flatfish, valued as a food. She was renamed G-3 on 17 November 1911, transferred to the New York Navy Yard for completion on 17 November 1913 following the cancellation of the Lake contract, launched on 27 December 1913, and commissioned on 22 March 1915. Service history After fitting out, G-3 proceeded to Bridgeport, Connecticut on 1 July to have sponsons fitted to the boat to increase stability. During submerged test runs off Port Jefferson in Long Island Sound two weeks later, however, her crew discovered several leaks and the submersible docked at the Lake Company's marine railway for repairs and alterations. These modifications – which included work on the main engine oiling system as well as sponson installation – lasted until 8 January 1916. On that date, she sailed back to the New York Navy Yard to be inclined and undergo a deep submergence test. The latter took place off Eaton's Point, Long Island, on 8 February, with Simon Lake – owner of the Lake Torpedo Boat Company – embarked. The boat successfully completed a test dive to and was preliminarily accepted by the Navy that same day. On 11 February, G-3 proceeded to New London, Connecticut, for initial shakedown operations. Aside from a brief period alongside submarine tender Tonopah (ex-Nevada) to repair damaged screws in March, she spent the next five months conducting trial runs, dive tests and training operations out of New London. Following another yard period at Bridgeport in mid-July to replace defective lube pumps, the boat moved to New York City on 30 August for final acceptance trials. Unfortunately, the breakdown of G-3s port engine disrupted her standardization trials in late September, prompting her move into the Navy Yard for repairs on 3 October. Difficulties in working in tight engine room spaces necessitated removing the port engine for repair and the boat remained immobile through the following spring.