The Port Authority is working on a hush-hush project to terror-proof the four PATH subway tunnels running under the Hudson River to thwart a potential catastrophic bombing that could flood the system, The Post has learned.
Defense contractors — toiling in the cloak of darkness — are installing reinforced metal plates along the interior walls of the tunnels, and massive flood-prevention gates are being erected at either end of the two main lines that run from the World Trade Center and the West Village to Jersey City, sources said.
