This Giant Tube Stopper Will Plug Flooded Subways and Choke Off Gas…

Numerous metropolitan subway systems around the country include spans that pass under bodies of water. If one of those lines were to spring a leak, the resulting flooding could be catastrophic. The Department of Homeland Security might have developed the answer—a giant, inflatable tube plug. » 3/28/12 12:20pm 3/28/12 12:20pm