It seems that there is a renewed interest in discovering and exploring/mapping the inner earth, if indeed such a place exists. Going on Admiral Byrd's reports from his expeditions in the 1930s, Dr. Brook Agnews is attemptoing an expedition in 2013 into the Artic aboard a Russian nuclear vessel to reach the entrance to Inner Earth.
At Red Dirt Report, they report on Dr. Agnew's planned Expedition for 2013.
Bible Prophecy is being fulfilled at an enormously fast rate! All the signs are being fulfilled, with the escalating war in the Middle East being the most obvious sign.
But here's a few Bible verses that speak of beings inside the Earth:
Revelation 9:1-3 Then the fifth angel sounded, and I saw a star from heaven which had fallen to the earth; and the key of the bottomless pit was given to him. 2 He opened the bottomless pit, and smoke went up out of the pit, like the smoke of a great furnace; and the sun and the air were darkened by the smoke of the pit. 3 Then out of the smoke came locusts upon the earth, and power was given them, as the scorpions of the earth have power.