Sandy Floods New York City's Subway System By Deborah Amos / NPR Published October 30, 2012 at 11:18 AM PDT This story was published more than 12 years ago. Facebook WhatsApp Email Listen Sandy Floods New York City's Subway System The New York City subway system remained closed on Tuesday in the wake of Sandy. Millions of gallons of water poured into the subway's tunnels, overwhelming its pump system.