Really just a place where they can hide so they don't get blowed up real good?
D.C. Plans Subterranean Visitor Center
http://www.sfgate.com/cgi-bin/article.cgi?f=/n/a/2005/05/20/national/w111912D82.DTLFifty feet below ground and steps from the U.S. Capitol, construction workers haul bricks and cement, lay marble and tiles and put other finishing touches on a subterranean project almost as large as the building itself.
When completed, the three-level catacomb will be a place to welcome Capitol visitors and make lawmakers safer in doing their business. To some, it also will serve as a tribute to Congress, telling its stories as an institution as well as the place where laws are made.
To critics, it stands as a half-billion-dollar monument to Washington excess.
Slated to open in September 2006, the Capitol Visitor Center will be the ninth and, by far, largest addition to the building in its history — nearly doubling its size...