Never happen here.
Well, it might get done. Eventually. Over budget, over time and come out in the wrong spot.
Plus it would only be half as long and would collapse, naturally just AFTER the dignitaries had left and the glowing news articles had been published.
Most of the overage in cost would be in attorneys fighting to get permission to dig to start with. I'm sure at least 20 years would be eaten up making sure that some worm (who can not be genetically differentiated from many other worms but does have a slightly different coloration) that only lives in one cave could be saved from the trauma of a tunnel being blasted within a few meters. The only way to prevent that trauma would be to give lots of money in fees to "Friends of the slightly discolored cave worm".