If you’re interested how some of these things got build in New York in the past I recommend the books of Robert Caro about Robert Moses.
Building new massive infrastructure requires a level of ruthlessness that is not socially acceptable these days.
Op's example was underground. Moses built above ground, thereby requiring the ruthlessness. Not sure the same ruthlessness would be needed with tunnels.
Op's example was underground. Moses built above ground, thereby requiring the ruthlessness. Not sure the same ruthlessness would be needed with tunnels.