gizmodocom:

Why Salt Water in the Subway Is So Extremely Dangerous

by Patrick DiJusto

Hurricane Sandy’s storm surge, which bulged into New York Harbor on Monday night, inundated much of lower Manhattan, parts of Brooklyn, and the barrier islands like the Rockaways in Queens.  The water got into some of the city’s subway, automobile, and electrical tunnels, and pumping the water out and bringing those tunnels back into working order is going to be a tall order—we’re talking many days or weeks to complete.  

What’s the big deal about water getting into subway and electrical tunnels?

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