'Extreme Makeover': Saving a School That Was Washed Away in a Flood (VIDEO)

The Tennessee floods of May, 2010 were a "1,000-year-event" -- the type of flood predicted to occur only once every millennium. Flooding caused at least $1.5 billion worth of damage in Nashville alone. It was a devastating once-in-a-lifetime event for residents in the area. Many television viewers also saw a one-time-only sight. Shocked viewers watched as a schoolhouse floated away -- down a flooded highway that had become a river.

This swept-away schoolhouse was part of the Lighthouse Christian School, which has been run by the Sweatt family since 2003. After the floods, the Sweatts led relief efforts in the area, assisting over 200 families. But now, their school is in danger of shutting for good ... unless they get some help. So 'Extreme Makeover' (Sun., 8PM ET on ABC) comes their aid.

The 'Makeover' team builds what may be the finest preschool in the state -- complete with themed classrooms, a two-storey indoor playground, tricycle racetrack and mock lighthouse. Most 'Extreme' episodes send the family on a trip to some far-off destination. But since the Sweatts are so attached to their home town, the show gave them a "stay-cation" right in Nashville.

Brain and Barbara Sweatt and their two kids got to meet country music star Keith Urban, who played the family a new song, and let the kids wail on his guitar. He previously helped host a telethon to aid flood victims.

The family also met LeAnn Rimes and Carrie Underwood. At the Grand Ole Opry, Carrie sang a ballad called "Temporary Home." But with over 18,000 man-hours going into the new preschool, the new building is permanent, not temporary.