It's basically Journey to the Center of the Earth without the dinosaurs crossed with Armageddon without Bruce Willis. The script isn't bad. Co-writer John Rogers has a degree in physics and is a former stand-up comic, and both are evident. If it is formulaic, at least it understands the formula reasonably well. There is something of a Ten Little Indians feeling, as members of the crew start getting picked off in various dramatic ways. Stanley Tucci wildly overacts as a fame-seeking scientist with a book deal. Everyone else in the cast does their professional best, but the only standout is D.J. Qualls as a super hacker who lives on Xena tapes and hot pockets.