Edit: Here is a video walk-through of the bunker!
https://www.youtube.com/watch?v=QFynhHBPzm4&feature=youtu.be
http://i.imgur.com/i7KJeJG.jpg
http://i.imgur.com/jOtxWlb.jpg
Here is a tutorial on how to do it.
http://www.reddit.com/r/DestinyTheGame/comments/2b80fh/hidden_area_glitch_seraphim_vault/
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Edited by Krimm: 7/21/2014 10:42:28 PMI think you inadvertently found the bunker where the AI Rasputin is housed. Why this conclusion, you ask? Two reasons: First - It's not a huge stretch of the imagination that "RAS" might be referring to Rasputin to begin with. Second - according to a Ukrainian colleague of mine, the names "Putin" and "Rasputin" are sometimes used in a word-play joke, which (very) loosely translates to: 1-putin 2-putin! Which leads me to believe "RAS-2" may be a nod to this word-play joke. Granted, Occam's razor suggests that the first reason is the most likely, however, given the importance of Old Russia so far, I wouldn't put it past Bungie to put in some subtle cultural references.