Overview and historical setting
The Gato class was the first large U.S. Fleet-submarine class built in wartime quantities for long-range Pacific operations.
The class belongs to the history of submarines and served during World War II. Submarine design is shaped by the tension between underwater endurance, speed, depth, sensors, weapons, habitability, and the need to remain difficult to detect. Changes in propulsion and mission systems can transform the operational meaning of a class even when the basic hull family remains recognizable. For Gato class, the documented mission set included attack-submarine operations, interdiction of maritime trade, and long-range patrol.
Development and design
Its range, habitability, ten torpedo tubes, and balanced surface and submerged performance made it the baseline for later Balao and Tench development. The program chronology records design work beginning in 1939, construction beginning in 1940, and the documented construction period ending in 1944. Program totals list 77 planned, 77 ordered, 77 laid down, 77 completed, and 0 cancelled. These dates and totals distinguish the design program from the number of ships that were actually completed and entered service.
The design evidence for Gato class identifies diesel electric, fleet submarine, and pacific range and attack-submarine operations, interdiction of maritime trade, and long-range patrol. These features connect the class's technical arrangement to the work it was expected to perform for United States Navy. Later refits, revised sensors, new weapons, and changes in doctrine could alter the practical capabilities of individual members without changing their class identity.
Technical character
The As completed configuration is presented as the as-completed configuration. Its listed characteristics include displacement 1,549 metric ton (surfaced), displacement 2,463 metric ton (submerged), length 95.02 m, beam 8.31 m, and draft 5.2 m. The recorded armament is 10 × 533 mm torpedo tubes; 24 torpedoes; deck gun. The figures describe one documented state and may not apply unchanged throughout the subject's service life.
Technical data for Gato class is most useful when tied to a date and mission. Displacement changed with fuel, ammunition, electronics, weapons, and later modifications; speed and range depended on operating conditions; and sensors or armament could vary substantially between members and periods of service.
Ships of the class
The documented roster contains 77 members. These include USS Gato (SS-212), USS Greenling (SS-213), USS Grouper (SS-214), USS Growler (SS-215), USS Grunion (SS-216), USS Guardfish (SS-217), USS Albacore (SS-218), USS Amberjack (SS-219), USS Barb (SS-220), and USS Blackfish (SS-221), with 67 additional documented members. The available sources support this as the complete class roster.
Individual ship histories are needed to show how a common design diverged through construction differences, refits, damage, transfers, new assignments, and final disposition. For a ship-level view of the class in service, see USS Cavalla, whose profile follows the evidence available for one member of Gato class.
Service history
Seventy-seven Gatos entered service; the class carried much of the U.S. Submarine offensive during the first half of the Pacific War. The shared design created a common starting point, while individual ships could accumulate different deployments, combat damage, modernization work, transfers, and end states.
Historical significance
Gato-class boats include several of the most successful and best-known U.S. Submarines of World War II. Its significance is best assessed through the relationship between mission, technical choices, production scale, and the service experience of its members.
For Gato class, the most useful points of comparison are the requirement for attack-submarine operations, interdiction of maritime trade, and long-range patrol, the use of diesel electric, fleet submarine, and pacific range, and a program recorded as 77 planned, 77 ordered, 77 laid down, 77 completed, and 0 cancelled. Those factors help explain what the class offered United States Navy, how it differed from predecessors or contemporaries, and why ships built to the same design could still have different careers.
Understanding Gato class across time requires separating the design as approved, the configuration in which individual ships entered service, and later changes made after operational experience. For United States Navy, that distinction matters because a refit could alter weapons, sensors, aviation facilities, command arrangements, or mission without creating a new class. The class history defines the common baseline; dated ship histories show how each member changed within it.
Ships in this class
Showing 77 recorded class members.
- USS Albacore
- USS Amberjack
- USS Angler
- USS Barb
- USS Bashaw
- USS Blackfish
- USS Bluefish
- USS Bluegill
- USS Bonefish
- USS Bream
- USS Cavalla
- USS Cero
- USS Cobia
- USS Cod
- USS Corvina
- USS Croaker
- USS Dace
- USS Darter
- USS Dorado
- USS Drum
- USS Finback
- USS Flasher
- USS Flier
- USS Flounder
- USS Flying Fish
- USS Gabilan
- USS Gato
- USS Golet
- USS Greenling
- USS Grouper
- USS Growler
- USS Grunion
- USS Guardfish
- USS Guavina
- USS Guitarro
- USS Gunnel
- USS Gurnard
- USS Haddo
- USS Haddock
- USS Hake
- USS Halibut
- USS Hammerhead
- USS Harder
- USS Herring
- USS Hoe
- USS Jack
- USS Kingfish
- USS Lapon
- USS Mingo
- USS Muskallunge
- USS Paddle
- USS Pargo
- USS Peto
- USS Pogy
- USS Pompon
- USS Puffer
- USS Rasher
- USS Raton
- USS Ray
- USS Redfin
- USS Robalo
- USS Rock
- USS Runner
- USS Sawfish
- USS Scamp
- USS Scorpion
- USS Shad
- USS Silversides
- USS Snook
- USS Steelhead
- USS Sunfish
- USS Tinosa
- USS Trigger
- USS Tullibee
- USS Tunny
- USS Wahoo
- USS Whale
Sources and further reading
- List of Gato-class submarines ↗Wikipedia · accessed 2026-09-18