Sinking?

[G3MM4]

I waqs reading an ebook that I'd found in the File Library. This ebook was about achieving a successful OBE. In it, it said something about the author "sinking through the earth and appearing on the other side" (or something like that) when she starts an OBE.

What I want to know is:

1) Has anyone here tried that method?
2) What would you see if you sunk through the earth?

I just think that it's a strange way of doing it. And I'd like to know a bit more about it.