Here are some photos of the Soviet-built Whiskey-class submarine that is featured in 'Forager.'

tpierce / Foter / Creative Commons Attribution-NonCommercial-ShareAlike 2.0 Generic (CC BY-NC-SA 2.0)Soviet-built Whiskey-class submarines in a Russian submarine grave yard.

 A photo of the Soviet-built Twin-Cylinder. It carried two nuclear armed, cruise missiles in the two cylinders. Photo from Wikimedia Commons, under the public domain.
This work has been released into the public domain by its author, I, One half 3544.