I don’t know that these are really abandoned, although they are obviously not getting quite the maintenance I’m sure they used to. Some massive subs. And to think that these pictures are on the Internet now… imagine the security that used to surround these craft.
Many more pictures (interior and exterior) at the link.
Retired fleet of Typhoon class submarines. The largest submarines ever built, they were, in their day, considered to be the most feared weapon of mass destruction ever created. There are many more photos and some text, in Russian.