The Earth is not hollow.
However, the Earth is huge and, as physicality is just illusion that looks real, the story must be much more complicated that it seems.
So, if we accept that the Earth is real, it is a massive ball.
It is not flat and it is not hollow.
However, just under the surface, relative to the size of the Earth, there are a number of caverns and tunnels, some made by nature and some constructed by beings, humans and others.
But the Earth is not hollow.
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