Question: What tunnel runs under the Hudson River and has a ventilation system innovated by Ole Knutsen Singstad?
Sentence (from "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.
Relevant evidence: Yes