Re: Swiss efficiency
"It is under a mountain i.e. nobody's back yard."
Several mountains and several hundred backyards.
Also several major fault lines. It's an impressive piece of work, especially considering that in these kinds of tunnelling projects it's never _quite_ certain what you'll encounter no matter how much seismic imaging you throw at the problem.
Amongst other things, the Swiss factored in time for delays for such things (which weren't needed), unlike british projects which are run on hopelessly optimistic timelines (Crossrail was relatively straightforward as the geology is very well known and it was archeology which was the big delay factor) and never designed to cater to slight usage expansions, resulting in having to "do it over" when the project proves insufficient for the task.