Wanna crack the secrets of a Kilo-class sub? There’s one at the San Diego Maritime Museum that you can walk through. If you’re of the nutritionally enhanced persuasion, just make sure you can fit through the small sizer ring on the dock first.
If you are referring to this, that’s a far-older and larger Foxtrot class submarine.
http://www.sdmaritime.org/b-39-submarine/