National Geographic: Inside Top Secret - Plant 42 (NaN)

If you haven't heard of Plant 42, you are not alone. Go inside America's “black world” of off-the-record projects developed in secret. Host Jake Ward, editor of Popular Science, explores the little-known projects still being built in America that are so confidential, some are said not to exist. His mission: to shine a light on the covert technology hidden all around us.