Salesforce' Marc Benioff asked Elon Musk to dig tunnels in SF. This is where they should go. Dream tunnels: Underground projects that could transform the Bay Area commute

San Francisco to Los Angeles: Interstate 5 is an uninteresting drive anyway. Elon Musk's Boring Co. engineers are proving they can build tunnels faster than other companies. Now, the world is beginning to think big about what's possible. In this gallery, we feature ideas people suggested on Twitter for tunnels in the Bay Area, the West and beyond. less San Francisco to Los Angeles: Interstate 5 is an uninteresting drive anyway. Elon Musk's Boring Co. engineers are proving they can build tunnels faster than other companies. Now, the world is beginning to ... more Photo: Getty Images Photo: Getty Images Image 1 of / 45 Caption Close Salesforce' Marc Benioff asked Elon Musk to dig tunnels in SF. This is where they should go. 1 / 45 Back to Gallery

Salesforce CEO Marc Benioff casually asked Elon Musk on Twitter Tuesday night if Musk's Boring Co. could build underground tunnels in San Francisco to help with rapid transit, just like he's trying to do in Los Angeles.

"Sure, we can do it," responded Musk, the Tesla CEO who has also sent rockets into space.

The exchange between the tech giants roused folks on social media who began throwing out suggestions for dream tunnel projects to transform commutes and reduce traffic. Ideas ranged from the brilliant, like another Transbay tube, to the ridiculous.

"Vancouver to Mexico City via the I-5 median," tweeted @JoeJustice, apparently ignoring the fact that there's no reason to traverse most of that route underground.

"Can you make a tunnel under the [Pacific Coast Highway] from Malibu to Santa Monica?" asked @MonicaLatvenas. "And make that strip of the PCH star free?"

See the local suggestions in the slideshow above and add your ideas in the comments.

ALSO, Elon Musk says Boring Co. test tunnel for high-speed travel to open in December

Musk launched his Boring Company dedicated to building underground tunnels efficiently and affordably in 2016. It came after Musk published a 57-page white paper in 2013 outlining an idea to move people between Los Angeles and San Francisco in a half an hour.

Now, his vision is coming to life in Los Angeles where the first of four planned tunnel projects is near completion. Musk has also talked about building an express service from O'Hare airport to downtown Chicago.

As Musk embarks on rethinking the way we get around, the world is beginning to think big about what's possible, and in the gallery above we feature some of the ideas suggested on Twitter for tunnels in the Bay Area, the West and beyond.

What ideas do you have for underground tunnels around the Bay Area? Share in the comments.