Elon Musk says first high-speed transit tunnel almost complete

Tesla CEO Elon Musk tweeted Sunday that his company's first high-speed transit tunnel is almost complete.

Musk tweeted that the first tunnel, under Hawthorne in Los Angeles, is almost done and will open on December 10. The underground tunnels are being built by his privately held company, The Boring Company.

The tunnels are expected to allow high-speed travel between cities.