During an expedition to Iceland, professor Trevor Anderson (Brendan Fraser), his nephew Sean (Josh Hutcherson) and their guide, Hannah (Anita Briem), get trapped in a cavern. As they follow their only escape route deeper and deeper below the Earth's surface, they pass through strange places and encounter incredible creatures, including dinosaurs. But as volcanic activity around them increases, they realize they must find their way out -- soon.

Runtime: 93 minutes
Rating: PG​