Musk made the announcement in response to a Twitter user’s post promoting his upcoming attendance at an artificial intelligence conference in Shanghai between Aug 29 and Aug 31.

The company, which develops tunnel-based transportation systems, won its first commercial contract in May to build a mile-long project to shuttle visitors around the Las Vegas Convention Center.

It also recently raised US$120 million in its first outside investment from chief investors 8VC, Vy Capital, Craft Ventures, Valor Capital and DFJ.

Boring Co has also built a test tunnel near its headquarters in Hawthorne, California.

A hoped-for tunnel in Los Angeles was scuttled after opposition from neighbourhood groups.

In Chicago, a proposed tunnel’s future is in doubt due to the departure of its biggest supporter, former Mayor Rahm Emanuel. Another potential project connecting Washington DC and Baltimore is in the environmental review process.