Terrible! Sounded good from the synopsis - a hidden world beneath the polar ice caps, and a team put together to go explore when another team goes missing - but the characters were so wooden and annoying that I fervently hoped all of them would die, violently, at the hands (well, teeth) of the T-Rex type creatures who live in the underground world. You had the stereotypical tough-gal single mom who brings her brat with her, the oh-so-hunky military guy she eventually beds, and the evil Arabic archetype who wants to blow everything up. I can't even bother to give more detail than that; it's not worth it. I'm surprised I even finished it.