Erin Burnett OutFront -

How did Virgin Galactic SpaceShipTwo pilot survive crash?

Less than a week after Virgin Galactic's SpaceShipTwo disintegrated high above California's Mojave desert, technicians are reportedly already back at work building a second SpaceShipTwo in hopes of resuming test flights as early as next summer.

It's a quick turnaround considering so many unknowns remain, including what exactly caused the crash, as well as the mystery of how one of the two pilots managed to survive a disaster that unraveled at the speed of sound, 50,000 feet in the air.

CNN's Dan Simon has more.