And if I remember right, the earths crust was 500 miles thick, not 3,600 or whatever the critic said it was.
From the review:
"I decided to do a bit of math concerning David and Dr. Perry's unguided trip through the Earth, since a handy display was kind enough to indicate they traveled almost to the core before heading back up. Nasa's website tells me the planet is 12,756 km in diameter. We can safely assume they traveled at least half that distance (6,378 km) and multiplying by 0.62 gives us 3,954 miles."
The display in the drilling machine didn't show them going through the crust. It showed them almost all the way to the core.
Though rather different than the book, this movie is still fun and entertaining.