It's always been open after you finish the campaign.
English
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No it hasn't, I was trying to glitch in for a long time. Door was sealed shut, and I had completed campaign already.
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Sorry. I misread your post. I thought you were talking about the path Up TO the Regeneration Center - not inside of it. I'll have to check it out. I have not been down there exploring in quite a while.
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Yeah, Ive been exploring. Doesnt appear to be of any importance. At least not yet