> it is genererally much cheaper to build a tunnel by cut and cover Coolo, you are building tunnels in a city that doesn't exist yet. Start here - https://en

> it is genererally much cheaper to build a tunnel by cut and cover Coolo, you are building tunnels in a city that doesn't exist yet. Start here - https://en.wikipedia.org/wiki/Opportunity_cost https://en.wikipedia.org/wiki/Opportunity_cost Do you have any interesting examples of modern day cut and cover that are not part of a TBM run? > TBMs are cool and useful They are what is needed to move humanity forward. You have trillion $ centers that using 3D you can add massive amounts of access to. This is not like reclaiming land from water, which is ~stealing, this is value adding through topography, it's creation.