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.
Ryfast Ryfast is a sub-sea tunnel system under construction in Norway. The tunnel system will be part of the Norwegian National Road 13 and it will run between the city of Stavanger, under a large fjord, and to the municipality of Strand in Rogaland county.