Well in one of the story missions we travel directly from the tunnels underneath the buried city to the black garden. So I don't think this is very likely. It was a good idea and had some concept art to back it up but I just don't see how it's possible now.
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Yeah thats what I was thinking. I just know that it was strongly believed prior to TTK that the black garden was inside the traveler. That mission says that we bound the garden to Mars when we destroyed the heart. How could we just put something that big onto a planet? So before, the garden was between dimension's kinda thing, now it is part of the physical world. Doesn't make sense to me