On Tuesday, Musk put the total price tag for the finished segment at about $10 million, including the cost of excavation, internal infrastructure, lighting, ventilation, safety systems, communications and a track.
By comparison, he said, digging a mile of tunnel by “traditional” engineering methods costs up to $1 billion and takes three to six months to complete…
Musk did not say how long it took to burrow his new tunnel, which ended up running short of the 2-mile easement his company originally requested for the project.
But he showed pre-recorded video footage of a newly built elevator station designed to carry passengers from street level to the tunnel’s subterranean entryway. The video featured a modified Tesla Model X luxury car on the elevator.