USS G-1

	USS G-1, ex-Seal, in 1912
History
United States
Name	Seal
Namesake	The seal
Builder	Newport News Shipbuilding & Drydock Co., Newport News, Virginia
Cost	$470,904.29 (hull and machinery)
Laid down	2 February 1909
Launched	8 February 1911
Sponsored by	Miss Margaret V. Lake
Commissioned	28 October 1912
Decommissioned	6 March 1920
Renamed	G-1 (Submarine No.19 1/2), 17 November 1911
Stricken	6 March 1920
Identification	Hull symbol: SS-20 (17 July 1920); Call sign: NSH; ;
Fate	Sunk as target, 21 June 1921
General characteristics
Class & type	G-class submarine
Displacement	400 long tons (410 t) surfaced; 516 long tons (524 t) submerged;
Length	161 ft (49 m)
Beam	13 ft 1 in (3.99 m)
Draft	12 ft 6 in (3.81 m)
Installed power	1,200 bhp (890 kW) (gasoline); 520 hp (390 kW) (electric);
Propulsion	2 × White & Middleton gasoline engines; 2 × Diehl Manufacturing Company electric motors, ; 2 × 60-Cell batteries; 2 × Propeller;
Speed	14 kn (26 km/h; 16 mph) surfaced; 10 kn (19 km/h; 12 mph) submerged;
Range	3,500 nmi (6,500 km; 4,000 mi) at 11 kn (20 km/h; 13 mph) on surface
Test depth	200 ft (61 m)
Complement	1 officer; 23 enlisted;
Armament	4 × 18-inch (450 mm) torpedo tubes (2 in trainable deck mounts, 2 internally in bow), 8 torpedoes

USS Seal/G-1 (SS-19½/20), also known as "Submarine No. 19 1/2", was the lead ship of her class of submarines of the United States Navy (USN). She was the first ship of the USN to be named for the seal, a sea mammal valued for its skin and oil, though she was renamed G-1 prior to commissioning.

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.