Department of Homeland Security looks to huge balloons to protect subways from flooding

Hurricane Sandy revealed just how vulnerable much of America's infrastructure is to flooding and other catastrophes, but the Department of Homeland Security is working on a solution that could protect subways and tunnels: balloons. The New York Times takes a look at a project overseen by the DHS's Science and Technology Directorate, which hopes to use large, inflatable plugs to prevent future flooding in underground tunnels. While still in the testing phase, the program has the potential to be b...