Picture of The Boring Company LA tunnel taken yesterday pic.twitter.com/TfdVKyXFsJ

— Elon Musk (@elonmusk) October 28, 2017

Musk elaborated that the tunnel is currently 500 feet long, and that in about a year, it will “hopefully” extend from Los Angeles International Airport to U.S. Route 101 along Interstate 405. The 405 is perhaps the most notoriously congested highway in the United States, and has helped earn L.A. the distinction of having, by some measures, the worst traffic in the country.

Musk’s Boring Company, first conceived while Musk himself was stuck in traffic, aims to alleviate those problems by taking vehicles off the road and sending them down a tunnel on high-speed electric ‘skates.’ Musk wrote elsewhere that the skates will travel at up to 150 mph. Musk has also recently shared previews of the elevators that will take cars underground.

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All this talk of tunnels and high speeds might remind you of another Musk side project: the Hyperloop. And in fact, The Boring Company’s focus on drilling tunnels more efficiently may converge with his 2013 proposal to send vehicles through low-pressure tubes at up to 600 miles per hour.

In early August, The Boring Company said that most of its tunnels it hopes to build would be “standard pressurized tunnels” — that is, without the vacuum that theoretically makes the Hyperloop’s ultra high speeds possible. But for longer routes on straight lines, such as a planned route between New York City and Washington, D.C., the company says building Hyperloop routes “will make sense.” Then, this month, Maryland’s governor announced that The Boring Company was building a Hyperloop route from Baltimore to Washington, D.C., though Musk has not entirely confirmed that.