Although Trevor (Brandon Fisher BrendanFraser) is a university address professor, he often does things that challenge tradition. He believes that Verne's novels are not science fiction, but real. It was because of this opposing theory that it was spread as a joke in the college and his academic reputation was destroyed. But Trevor didn't care about it. He firmly believed that his theory was correct. To test his theory, Trevor takes nephew Sean (Josh Hutchison JoshHutcherson) and local guide Hannah (Anita Brem AnitaBriem) on a trip to Iceland. During the trip, the trio accidentally found a strange cave and fell through the thin ice into a bottomless abyss during the inquiry. However, when they wake up, they find a mysterious inner world full of strange creatures, exactly the same as the scene described in Verne's novel. The evidence is finally found, but how to bring it back to the ground? The Trevor trio began their journey to find a way out.