Engineers Test Balloon to Keep Tunnels from Flooding

The three-minute procedure was the latest test of a device that may someday help guard real tunnels during disasters like Hurricane Sandy, whose wind-driven surge of water overwhelmed New York City’s subway system, shutting it down for days.
November 20, 2012

The three-minute procedure was the latest test of a device that may someday help guard real tunnels during disasters like Hurricane Sandy, whose wind-driven surge of water overwhelmed New York City’s subway system, shutting it down for days.

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