This tunnel is in the movie National Treasure 2 where a piece of movie is filmed called the hall of records.
Sixteen porcelain enamel panels containing the text from the Declaration of Independence, the Constitution, and the Bill of Rights, along with a biography of Borglum, and the story of the presidents, were sealed in a teakwood box, then placed in a titanium vault, and finally sealed shut under the weight of a 1,200 pound granite capstone inside the unfinished hall.