Except it does seem to have addressed that. Even the dumb test tunnel seems to have been completed for far less than it should've taken, given the constraints you mentioned.
Experts (including those who have studied foreign mass transit in detail) are at a loss to fully explain why the US's tunneling costs are so out of whack compared to other countries. Sometimes, when expert systems seem to have failed, it's a useful exercise to throw everything out (i.e. be "utterly uninformed") and learn from scratch by trying. They may fail anyway, but it's worth a shot.
Sometimes, the naive intern will find a solution because of their own naïveté. (And even then there are lots of practical things that will need to be relearned, at great pain.)
Experts (including those who have studied foreign mass transit in detail) are at a loss to fully explain why the US's tunneling costs are so out of whack compared to other countries. Sometimes, when expert systems seem to have failed, it's a useful exercise to throw everything out (i.e. be "utterly uninformed") and learn from scratch by trying. They may fail anyway, but it's worth a shot.
Sometimes, the naive intern will find a solution because of their own naïveté. (And even then there are lots of practical things that will need to be relearned, at great pain.)