Outspoken Elon Musk has doubled down on his new work-from-home ultimatum sent to Tesla staff Tuesday, sending out a second email to say 'if you don't show up, we will assume you have resigned.'

'Everyone at Tesla is required to spend a minimum of 40 hours in the office per week,' Musk, 50, wrote in a second email sent to staff just hours after the first, which was leaked and reported by Teslarati.

The message, shared by Twitter user @SamNissim, bears the subject line 'To be super clear' and was sent to an email list labeled 'Everyone' at 10:51 pm.

In it, Musk reasserted his commitment to statements made in the previous message -  and seemed to take a shot at woke Silicon Valley companies for their remote policies in the process.

'The office must be where your actual colleagues are located, not some remote pseudo office,' it reads, reiterating assertions from the prior email, which stated staff would only be allowed to work from home if they worked 40 hours a week in-office.   

Musk then declared: 'If you don't show up, we will assume you have resigned.'

The email proceeds to clarify statements made by Musk - whom has been vocal of his opposition to remote work in the past - in the previous email, which was sent to the carmaker's senior staff at 1:19 pm, screenshots show.

'The more senior you are, the more visible must be your presence,' Musk wrote. 

'That is why I lived in the factory so much - so that those on the line could see me working alongside them. If I had not done that, Tesla would long ago have gone bankrupt.'