By Henry Fountain / The Bulletin
November 21, 2012
MORGANTOWN, W.Va. — With a few dull thuds, the 1-ton bag of high-strength fabric tumbled from the wall of the mock subway tunnel and onto the floor. Then it began to grow.
As air flowed into it through a hose, the bundle inflated until it was crammed tight inside the 16-foot-diameter tunnel,....