Turns out, we might be safer if we never leave the city. Ever. Well sort of. A [new study] based on an analysis done by the Port Authority of New York and New Jersey found that train tunnels under the Hudson River are more vulnerable to a bomb attack than previously thought. Apparently, it would only take a fairly small amount of high explosives to cause major flooding of the rail system, explains [The New York Times](http://www.nytimes.com/2006/12/22/nyregion/22security.html?hp&ex=1166850000&en=afb631e839568d31&ei=5094&partner=homepage). The analysis shows that in less than the time it takes for your morning shower (depending on what you do in there), the tunnels could flood.
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