Elon Musk unveiled the first part of an underground tunnel built in Los Angeles by his construction firm, the Boring Company.
Video source: VCG
Musk touted the one-mile-long segment as a breakthrough in low-cost, fast-digging technology.
He said that when finished, his tunnels will be a remedy to the city's infamously heavy traffic.
When fully operational, the "loop" will use electric platforms — or "skates" — to carry passengers and vehicles at speeds of up to 150 miles per hour.
Last month, the Boring Company scrapped plans for a tunnel under the West Los Angeles neighborhood, settling litigation brought by community groups opposed to that project.
But it's moving ahead with a tunnel between Dodger Stadium and an existing subway line.
In June, the city of Chicago chose Boring to build a 17-mile underground transit system between its downtown and the main airport.
Boring has proposed an East Coast Loop linking Washington, DC, to the Maryland suburbs.