If it were anyone else, the notion of digging hundreds of miles of tunnels to create a new subterranean transportation network under congested cities would seem like pure science fiction.
But the dreamer behind this vision is Elon Musk, the billionaire innovator who has already shown with his Tesla electric cars and SpaceX rockets that he thinks big and doesn't wait for others to transform fantasy into reality.
Once again, Musk is aiming to shake up an arcane industry not used to outside-the-box thinking and yet potentially ripe for disruption: the underground world of tunneling.
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