CDR Salamander has a neat post about an encounter with a Russian submarine. As an added bonus, it has this fascinating “home video” about life aboard the Russian sub in question, the Orenburg.
Roughly the first half is exterior shots. You can skip forward to the interior stuff.
As others have noted, there’s a very different feel, atmosphere, to the Russian sub. It looks lived in and comfortably inhabited, as opposed to the almost sterile aesthetics of a US submarine.