Greetings and hallucinations: I have read an article on the adventures to the interior of the earth, if you wish to read the article, and it is lengthy, the site is located at http://www.ourhollowearth.com/SGContents.htm , it seems these scandinavians were looking for the entrance, in the ocean no less, but it is good reading, give it a shot and let me know what you think.
lilwolf

This has been discussed quite a bit, and the conclusion is almost always the same. The earth isn't hollow. Tectonic movement, the Earths mass and some other things wouldnt add up if the Earth was actually hollow. Than again, you never know. Not long ago we thought the Earth was flat.

The main theory is that the earth's interior is full of molten rock and metals, but I guess that it's POSSIBLE that the earth's interior is hollow.

It's more probable that theres a huge cavity in the earth's interior, rather than the whole of it is empty.