It's called The Core, and it opens in the USA this Friday.

"The Earth's core has inexplicably stopped spinning, causing a breakdown of the global magnetic field that has sheltered life from deadly solar and cosmic radiation for billions of years. Flocks of birds fly into buildings. Pacemaker wearers drop dead in the streets. Super-charged lightning batters the planet. The government mounts a desperate mission to tunnel more than 1,800 miles into the Earth to jump-start the stalled core and restore the planet's magnetic shield before all life is extinguished. ..."

OK, it's starting to sound silly, but the initial scenario is a very real possibility. I can't wait to see how the show the effects of cosmic radiation and global turmoil & terror.