At Tesla's headquarters in Austin, Texas, a new bunkerlike structure is under construction that could one day help move the company beyond electric vehicle manufacturing.

When it's completed, the building will house part of a new supercomputer, known as Dojo, that Tesla is assembling to help run the artificial intelligence software behind the self-driving capabilities in its vehicles, according to two people familiar with the project. Eventually, Tesla could use Dojo to sell cloud services to other companies, the way Amazon Web Services does, the company's CEO, Elon Musk, has said.