[Pollster1]

US Submarine production (for domestic use - I don’t know how many we exported, if any):

1940: 5
1941: 13
1942: 33
1943: 56
1944: 79
1945: 42 (part year)

Pretty impressive ramp up from 5 and 13 pre-war to 56 and then 79, more than one per week, in the last two full years of the war.

[MasterGunner01]

Other than for training on the East Coast by older boats, all new construction boats went to the Pacific Theater of Operations where the boats deployed from Pearl Harbor (ComSubPac) or Australia (ComSubSouWestPac). The Gato, Balao, and Tench class boats became the killers of the Imperial Navy and merchant marine in the Pacific War.

The Germans lost the Battle of the Atlantic — trying to strangle the flow of war materials to the UK and Russia. Of 1,158 boats built, Germany lost 781 submarines and 30,000 of 40,000 submariners.

American submarines accomplished with the Japanese Empire what the Germans failed to do in the Atlantic Theater of Operations and with with lesser forces deployed. The US Navy sent 288 submarines of all types against Japan. The US Navy submarine force represented 1.6% of US Navy personnel. The US Navy lost 52 boats with a casualty rate of 22% killed — highest of all the US military branches. It destroyed 2/3 of the Japanese merchant fleet and 1/3 of the IJN afloat on 7 December 1941. American submariners won their war in the Pacific Theater.