Inflatable plugs for subway tunnels
Posted by freesong on 11/10/2012, 6:38 pm
To prevent flooding??   Like an auto airbag--interesting concept already being tested.

http://www.weather.com/news/weather-hurricanes/subway-tunnel-plug-20121109
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Inflatable plugs for subway tunnels - freesong, 11/10/2012, 6:38 pm
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