When he first tweeted about boring a tunnel underneath Los Angeles, people sort of laughed. Then the Tesla and SpaceX mastermind started actually digging a tunnel underneath Los Angeles. In January, at the SpaceX headquarters in the shadow of LAX, engineers created a"test trench" that measured 30 feet wide by 50 feet long by 15 feet deep.
"If you were to extrapolate that to cars, and have more car tunnels, then you would alleviate congestion completely. You would not need a flying car in that case,” Musk said. "And it would always work, even if the weather is bad. It would never ice up, and it would never fall on your head.”
The truth is, down the road, Musk will be heavily reliant on digging. The next-gen infrastructure, Musk has said, will move from a 2D tabletop to a 3D complex up to 30 layers deep, and that infrastructure will include roads, train tunnels and—most crucially—his very own Hyperloop. So, in classic Musk fashion, Elon has formed a tunnel boring machine company, called The Boring Company.