Tesla Inc.  (TSLA) - Get Report CEO Elon Musk said in an interview the electric car company was "close to death" during the troubled ramp-up of the mass market Model 3.

During an interview on "Axios on HBO," Musk said the company was within "single-digit weeks" of going under and "bleeding money like crazy." He has previously said that the company nearly went bankrupt in 2008, the year he took over as CEO, and that at the time Tesla had "less than a 10% likelihood to succeed." 

Musk, who said he was sleeping in the factory, has also called the Model 3 buildout "production hell."

"No one should put this many hours into work," Musk said during the interview. "This is not good. It was very painful. It hurts my brain and my heart."

Musk's erratic behavior, including puffing from a cannabis-laced cigarette and drinking whiskey during a live interview, has caused concerned among some investors and the stock has suffered.

Shares of Tesla were up 5% to $342.17 on Monday.

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