"Help me, it's Ally. Please help me." A ghostly, sobbing voice is detected from the depths of Russia's Kola super deep borehole - 9 miles down. A Russian team is dispatched in a desperate rescue mission to find the woman. But how did she get there? Meanwhile, the Americans prepare their own expedition after a new rift leading to the center of the Earth has been discovered at the bottom of the Mariana Trench in the Western Pacific...