On May 25th, 1950, the Brooklyn-Battery Tunnel opened to the public for the first time, connecting the Financial District in Manhattan to Red Hook in Brooklyn.
It consists of twin tubes, carrying four traffic lanes, and at 9,117 feet (2,779 m) is the longest continuous underwater vehicular tunnel in North America. […] It has a total of four ventilation buildings: two in Manhattan, one in Brooklyn, and one on Governors Island that can completely change the air inside the tunnel every 90 seconds.
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