Here you go. PLenty of reading and pics to look at. Its the USN manual for fleet submarines.
Be sure to check out the links to other manuals pertaining to fleet boat training.
http://www.maritime.org/fleetsub/index.htm
In the Preface it mentions that the Perch SS-313 is used to represent the class, but newer submarines were used to illustrate more modern items. She's a Balao class, not a Gato.