Elon Musk's Next Frontier Is Underground

Elon Musk's Next Frontier Is Underground
AP Photo/Ringo H.W. Chiu, File

Elon Musk wants to dig tunnels. Without them, he says, “we will all be in traffic hell forever.” It's a well-timed ambition, given President Trump's plan to spend $1 trillion on infrastructure projects. Let's hope he can figure out what he's doing.

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