We have no idea what we’re doing,” declared Elon Musk, standing beside a yawning “test trench” in Southern California in 2017 ...

Elon Musk built his reputation on turning improbable bets into working rockets and electric cars, but his tunneling venture ...

Billionaire Elon Musk says he's almost completed a tunnel under a Los Angeles suburb to test a novel transportation system that would scoot commuters underground on electric sleds called skates. Musk ...