Well its absolute nonsense BUT Admiral Byrd was sent by President Hoover to examine the potential of mining the Arctic poles for Uranium in about
1947.
He went "missing" for a few days, said he and his team got disorientated and ended up "Inside the Hollow Earth".
He wrote this little memo about his "missing" few days ..............
www.v-j-enterprises.com...
Its really interesting, absolute nonsense of course but it does make you wonder why Hoover had such faith in Byrd.