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.
Hudson River Waterfront Walkway The Hudson River Waterfront Walkway, also known as the Hudson River Walkway, is an ongoing and incomplete project located on Kill van Kull and the western shore of Upper New York Bay and the Hudson River, implemented as part of a New Jersey state-mandated master plan to connect the municipalities from the Bayonne Bridge to the George Washington Bridge with an urban linear park and provide contiguous unhindered access to the water's edge.