For the first time in history, workers will complete the demolition and cleanup of an entire gaseous diffusion complex.

The four-story, 383,000-square-foot K-27 Building is the final building to be demolished in the East Tennessee Technology Park in Oak Ridge, Tennessee.

K-27 and East Tennessee Technology Park’s other facilities -- K-29, K-33, K-31 and K-25 -- once produced highly enriched uranium for national defense and commercial energy production. At 44 acres, the mile-long, U-shaped K-25 facility was once the world’s largest building under one roof.

The Department of Energy’s Environmental Management (EM) office recently kicked of the demolition with a ceremonial “first bite.” Demolition is expected to be complete by the end of the year.

Check out the video of the demolition of K-27 above. Visit EM’s webpage for more information on this and other cleanup priorities.