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You could calculate the cost to tunnel under one linear mile at 40 ft diameter and then realize that whatever number you got, it is the cheap part because you h
by svnt 3y ago
You could calculate the cost to tunnel under one linear mile at 40 ft diameter and then realize that whatever number you got, it is the cheap part because you haven’t reinforced, drained, ventilated, or surfaced the tunnel.
This doesn’t require a discussion to figure out. You just have to mentally walk through the process and do some back of the envelope math.
- SonicScrub 3y agoIt's even easier than walking through that. Just Google the costs per mile of a typical subway line extension. There's a reason subterranean rails only makes when land costs are at a premium.