Hollow Earth: Secret Diary of Admiral Byrd?

There are many theories about the inner earth usually called Agartha. This story is not very new, but looks very interesting though.

In 1947 the Admiral Byrd was sent by President Hoover to examine the potential of mining the Arctic poles for Uranium and this is his diary from the mission. He not only found the entrance to the inner earth but also met some of the people living there.

http://www.v-j-enterprises.com/byrdiar.html