Entrepreneur Elon Musk has said the first testing tunnel of his Hyperloop transport system is nearly fully completed, and will be open to the public later this year.
The project promises to carry cars underground at speeds of up to 155 miles per hour.
Elon Musk announced on his Twitter page the launch date of his high-speed underground tunnel transportation system - the event is said to be followed up by a day of free rides for the public.
Musk's venture, "The Boring Company", has been pushing the underground system as a futuristic concept that could radically speed transport within and between cities. The company will then offer free rides to the public the next day, he said, allowing passengers to travel as fast as 155 miles per hour.
Elon Musk has come a step closer to creating a "loop" transit system beneath Los Angeles to bring an end to "soul-destroying traffic" in the city.
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The Test Tunnel, as it's called, is the first leg of Musk's underground tunnel system located underneath the streets of Hawthorne, California.
Dubbed "Elon time" critics of Musk have pointed to his history of missing deadlines or setting unrealistic timelines, most notably with the slow production of Tesla's mass market Model 3.
Musk has a reputation for often missing his own timelines, which prompted someone on Twitter to ask if the December 10 date is "in real time or Elon time?"