Board Thread:Questions and Answers Forum/@comment-114.78.1.191-20141015084744/@comment-24306135-20141015120629

I think that's where the first loot cave was, where people would stand outside and kill super low level Hive, which proceeded to drop redicluous amounts of engrams, which where then taken to the engram vendor at the Tower to be decoded and gain rare and Legendary gear. The engram vendor's name is Master Rahool, explaining the remains you found and the remark about kills. This cave was recently patched out of the game, and I would guess that Bungie added this easter egg as a nod to the community who abstained from such practices.