What tunnel runs under the Hudson River and has a ventilation system innovated by Ole Knutsen Singstad?
Ole Singstad Ole Knutsen Singstad (June 29, 1882 – December 8, 1969) was a Norwegian-American civil engineer who innovated the ventilation system for the Holland Tunnel (which subsequently became commonly used in other automotive tunnels) and advanced the use of the "Sunk-tube" method of underwater vehicular tunnel building, a system of constructing the tunnels with prefabricated sections.
Canal Street (Manhattan) Canal Street is a major east-west street in Lower Manhattan, New York City, running from East Broadway between Essex and Jefferson Streets in the east, to West Street between Watts and Spring Streets in the west. It runs through the neighborhood of Chinatown, and forms the southern boundaries of SoHo and Little Italy as well as the northern boundary of Tribeca. The street acts as a major connector between Jersey City, New Jersey, via the Holland Tunnel (I-78), and Brooklyn, New York City, via the Manhattan Bridge. It is a two-way street for most of its length – from West Street to the Manhattan Bridge – with two unidirectional stretches between Forsyth Street and the Manhattan Bridge.