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.
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Source: http://feeds.gawker.com/~r/gizmodo/full/~3/8UpX2WjdMDA/this-giant-tube-stopper-will-plug-flooded-subways-and-choke-off-gas-attacks
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