i would say half of the movie be hollywood fiction and and the other half could be a remote possibility only because i believe that the earth magnetic pole have shift and in the distant past . however and i do not think jump start earth nickel iron core and will resume proper rotation and prevent gravity failure from suck every know object out into space . i be fascinate by the visual rendering of what may lie beneath the earth crust . especially the hot and hostile environment inside the mantle . can you imagine . i still laugh at the deep burrowing craft develop for the mission itself . which be the mechanical equivalent of a diamond or carbide toothed sea lamprey ( specie of leech ) . i agree the filmmaker opt for such a lofty objective and be obviously gun for huge box office receipt just like deep impact and and armageddon . nice try guy . at least get your science down right before make such an ambitious film and and do not cast hilary swank for such intellectual role and like a physicist anymore .