SO what is a tench-class submarine, just like the USS Remora. Well

A Tench-Class submarine was a type of sub built specifically for the United States Navy from 1944 to 1951. They were a new improved designed over previous models which included the Gato and Balao classes. With only a small increase in overall weight (40 tons) they were able to be stronger and have an improved internal layout, in addition to more fuel possibilities.

With more fuel available the USS Remora went from being able to travel 11000 nautical miles to 16000. Initially there were to be 84 Tench Class subs to be built. However, after the realization that the US would not need that many to defeat Japan, 55 of them were cancelled. The remaining 29 subs were commissioned between 1944 and 1951.