Tesla Fremont factory In this May 14, 2015 file photo, Kuka robots work on Tesla Model S cars in the Tesla factory in Fremont, Calif.AP Photo/Jeff Chiu

Tesla rarely lets cameras into its car factory in Fremont, California, where it assembles its high-end Model S and Model X. 

But the electric car maker recently let KPIX 5, a CBS TV affiliate in the Bay Area, into the massive facility to check out how its vehicles come together. 

Here's a look inside the secretive factory where Tesla builds its high-tech cars. 

 

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