> The skill these workers must have aquired working on these large-scale tunnelling projects is impressive. Judging by the cost and speed of tunneling projects

> The skill these workers must have aquired working on these large-scale tunnelling projects is impressive. Judging by the cost and speed of tunneling projects of the last century or so, one would have to conclude that we are in fact somehow getting worse at it. Nearly across the world, tunneling is happening slower and at greater cost than previously.