Tench-class submarine

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Tench-class submarines were a type of submarines built for the United States Navy (USN) between 1944 and 1951. They were an improvement over the preceding Gato and Balao classes, only about 35 to 40 tons larger, but more strongly built and with a slightly improved internal layout. One of the ballast tanks was converted to carry fuel, increasing range from 11,000 to 16,000 nautical miles (20,000 to 30,000 km; 13,000 to 18,000 mi). This improvement was also made on some boats of the previous two classes. Further improvements were made beginning with SS-435, which are sometimes referred to as the Corsair class. Initial plans called for 80 to be built, and orders eventually were placed for 134 (numbered SS-417 to SS-550), but 105 were cancelled in 1944, 1945, and 1946, when it became apparent that they would not be needed to defeat Japan; a further 12 boats (SS-551 to SS-562) were planned to be ordered in 1945, but orders for these were never placed. Some of these (including numerous units...

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