I couldn't help but notice something while doing the hard raid last night. If you stand at the vault door (back faced to it and not open), look up, it may be hard to see but there seems to be a hallway above the entrance to the actual vault. If anyone on Xbox 360 would like to do some snooping around message me, gamertag is tiggle man.
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I've been looking for people to explore with on 360. Add me if you want. GT is same as here.
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I've seen it too, couldn't quite reach it though