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By Keith Wagstaff

Tesla founder Elon Musk is pretty sure Apple is working on an electric car. Speaking to the BBC, Musk said that it's an "open secret" that Cupertino engineers are building an automobile.

"It's pretty hard to hide something if you hire over a thousand engineers to do it," he said, according to a BBC article published on Monday.

Apple CEO Tim Cook has played coy about the company's plans. In October, when asked at a conference about whether it was pursuing an electric car, he replied, "We'll see what we do in the future."

He added, "I do think that industry is at an inflection point for massive change. Not just an evolutionary change."

Musk didn't sound scared when asked about the prospect of Apple entering the market, telling the BBC that it would "expand the industry."

Related: Your Tesla May Someday Drive Across the Country to Pick You Up

Recently, Apple has been promoting its CarPlay dashboard software, which now runs on 100 models from 21 car brands. Tesla might also have to keep an eye on Faraday Future, the Chinese company that unveiled an electric concept car last week at CES in Las Vegas.

Tesla has said that it's several years away from releasing the Model 3. At around $35,000, it would be far cheaper than the current most affordable option, which starts at $75,000.