User blog comment:DivaytFyr/Yet just another speculation/@comment-5551986-20130517234928

Tis, but a mystery. If he was on the Moon, I got no idea how he managed to take the powers of mixed blood Quincy so far away, seems that he must have been somewhere on Earth to absorb their power. If it was extra-terrestrial, I'd suggest Pluto or Europa. Because of liquid/ice, the only way the moon can have any liquid/ice on it is via comets, and it wouldn't have enough to cause ice to attach to structures. Pluto does have liquid/ice, but no oxygen. So I'd suggest Europa as it is believed to contain some forms of oxygen, and the entire moon is more or less ice. That's "IF" its extra-terrestrial. [Note: The Vandenreich base is icy]

In the Bleach universe, I think its located somewhere on Earth in Russia, Scandinavia, and is under somewhere. Only because (besides the fact it is dark, although some places in Scandinavia and Russia are covered in darkness for several days for 24 hours.) and another reason is because Uryu seemed to have made it to the base fairly quickly, and my final reason is because the Quincies existed on Earth right? It'd be safe to assume the Shinigami-Quincy wars that happened over the course of 1000 years, happened on Earth, now. If Yhwach was "The Sealed King", it couldn't have been that far from the Earth. However. I think it could be in the Dangai, how do we know that there isn't more behind its walls and considering Quincy can remove Reishi and use it, they could bypass the wall and access more of the Dangai? ~ (Could also slightly be part of How Yhwach looks like a healthy 30 year old despite being 1000+, not because of his heart or whatever but you know) Or, in the precipice world in Garganta, that's dark. "Could" be possible, and its been explained that when you fall you don't return, we have yet to see someone fall. Maybe like a weird DBZ falling off Snake Way scenario, but that's a weird theory as to how Yhwach got access to a Garganta is but a small loop hole in that little theory of mine. And finallllly.

So far Shinigami's come from Sereitei (A seperate dimension from the human world) and use the Dangai and Senkaimon. Hollows are in Hueco Mundo and can use the Garganta. Fullbringers/Humans use the Human world. Who is to say Quincy don't have their own Dimension? Or way of crossing the dimensions? They seem to, as to looking how they summoned soldiers. But then again, they could have made a portal directly to their base and not taken any form of "path".