Workers monitor the lifting of the left spent booster used during space shuttle Discovery's final launch.

Workers at the hoisting slip at the Solid Rocket Booster Disassembly Facility at Hangar AF on Cape Canaveral Air Force Station in Florida, monitor the lifting of the left spent booster, used during space shuttle Discovery's final launch.

The shuttle's two solid rocket booster casings and associated flight hardware are recovered in the Atlantic Ocean after every launch by Freedom Star and Liberty Star. The boosters impact the Atlantic about seven minutes after liftoff and the retrieval ships are stationed about 10 miles from the impact area at the time of splashdown. After the spent segments are processed, they will be transported to Utah, where they will be refurbished and stored, if needed. Photo credit: NASA/Jim Grossmann