Freight would be a great case for tunnels, if you could find a way to make the freight companies (say, Amazon) pay to use it. There's a reason why Amazon is pus

Freight would be a great case for tunnels, if you could find a way to make the freight companies (say, Amazon) pay to use it. There's a reason why Amazon is pushing drone delivery, and I bet it's because they think they can get the rights to use the skies for free.