What tunnel runs under the Hudson River and has a ventilation system innovated by Ole Knutsen Singstad?
Holland Tunnel The Holland Tunnel is a highway tunnel under the Hudson River between Manhattan in New York City and Jersey City, New Jersey. Its two tubes carry eastbound and westbound Interstate 78. In New Jersey, it is also designated NJ 139. An integral conduit within the New York Metropolitan Area, it opened in 1927 as the first of two vehicular tunnels under the river, the other being the Lincoln Tunnel. Both are operated by the Port Authority of New York and New Jersey.
58 Joralemon Street 58 Joralemon Street, in Brooklyn Heights, Brooklyn, New York, United States, is a Greek Revival structure built in 1847 as a private residence, but is now a New York City Subway vent. The property was acquired by the Interborough Rapid Transit Company in 1908, who gutted the interior and converted the structure to "the world’s only Greek Revival subway ventilator". The ventilator also serves as an emergency exit from the eastern end of the New York City Subway's Joralemon Street Tunnel, which carries the IRT Lexington Avenue Line ( trains ) between Bowling Green and Borough Hall, where it becomes the IRT Eastern Parkway Line ( trains ).