Although lots of people came to witness the tunnel opening, there wasn't space for everyone.
Musk's presentation was broadcast live at 8:15 p.m. local time so people who couldn't make the exclusive launch party could tune in.
Musk gave a 30-minute presentation.
After emerging from the tunnel in a modified Tesla Model X, Musk said he hoped in the future that tunnels dug by the Boring Company could be the answer to "soul destroying" traffic.
Guests didn't get a ride in the tunnel.
In the past Musk said "free rides" would be available, but no guests were allowed to travel inside the tunnel at the unveiling on Tuesday
The tunnelling process is much slower, however.
"Aspirationally, we should be slightly faster than a snail," Musk said.
He explained that most tunnelling equipment moves 14 times slower than a snail, and hopes to match to snail-speed with The Boring Company.
Musk tweeted a picture of a modified Tesla Model X nestled inside the tunnel, locked in by retractable wheel gears, which effectively turn it into a "rail-guided train."
Musk said that in future the tunnel loop might carry passenger cars on "skates" that whizz them through the tunnels, or that cars might eventually be fitted retractable side wheel, so they could travel through the tunnel autonomously.
Tesla in @boringcompany tunnel with retractable wheel gear that turns a car into a rail-guided train & back again pic.twitter.com/3a6i0NoSmi
— Elon Musk (@elonmusk)
December 19, 2018
The Boring Company also released a video of a Tesla being whisked along inside the tunnel.