Tunnel fires, floods may soon be stopped by balloon technology
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WASHINGTON — Homeland Security officials seeking to counter terrorist bombs in subway and highway tunnels are hoping to use inflatable balloons, giant plugs and blast-resistant liners that could protect the nation's transit systems from underground fires and floods.
The new program, dubbed "Resilient Tunnel," aims to address post-9/11 concerns that terrorists will target vulnerable tunnels, trapping and killing countless commuters, flooding cities and causing billions of dollars of damage.