Tesla and SpaceX CEO Elon Musk teased his newest endeavor with a picture of a Model S inside a tunnel that he’s digging in Los Angeles.

Like so many of Musk’s projects, this isn’t just any ol’ tunnel. Musk’s startup, The Boring Company, is digging a tunnel that will be used to transport vehicles at high speeds to avoid traffic congestion. The idea is to lower vehicles via an elevator to a tunnel, where it’s then transported—not driven—in a “sled” along magnetic rails at high speeds.

The Boring Company, was inspired by traffic congestion Musk experienced in Los Angeles. The aim is to find a way cost-effectively dig networks of tunnels for vehicles and high-speed trains.

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