Is the earth hollow and is there life inside the earth?

In the "Magic Presence" Saint Germain states that there is indeed
intelligent life inside the earth, although it is not clear if it is meant
in the physical or astral or etheric plane.

This is just one reference amongst many alluding to the possibility
of life inside the earth. In one account a sailor accidentally sailed
through a pole opening into the inner earth and met human-like
life there. Supposedly there is an inner sun that assists life inside
the inner earth.

I was curious to know if you have any experience/information about
this issue? Thank you kindly.