That's just shy of the cost of building (drilling?) the longest road tunnel in the world, in Norway, which has really high labour costs. So I'd guess it goes a

That's just shy of the cost of building (drilling?) the longest road tunnel in the world, in Norway, which has really high labour costs. So I'd guess it goes a long way (pun intended). https://en.wikipedia.org/wiki/Lærdal_Tunnel https://en.wikipedia.org/wiki/Lærdal_Tunnel