Interesting. I wonder what kind of energy is needed to keep 12000km long tunnel situated 4+km below sea level at partial vacuum...
Without even getting into problems that will occur at tectonic plate boundaries...
Without even getting into problems that will occur at tectonic plate boundaries...
Not to downplay the size of the task, of course; it would be an astonishing feat of engineering and probably quite out of our reach for the foreseeable future, at any kind of reasonable cost anyway. The tectonic boundaries, as you say, would present a particularly challenging aspect of the project. However, theoretically it's probably the most efficient way from A to B on our little blue marble and so no doubt it'll be done eventually.