Re: The Official Rate/Review Thread for TDKR (TAG SPOILERS!!!) - Part 3
"There are many forms of immortality, Bruce"
"The Pit" was more or less Nolan's version of the Lazarus Pit. You could even go so far as to say that the pit is a source of Ra's immortality/legacy in that Talia was born down there.
I thought the Pit/prison was a pretty mystical place myself, despite its lack of a bubbly green pool.