In an email to SpaceX staff that was first obtained by Space Explored, Musk said the firm could go under due to issues producing Raptor rocket engines. The Raptor engines power SpaceX’s Starship rockets, which the company hopes to take people to the moon and Mars. Musk told staff that a “Raptor production crisis” threatens the firm’s future: The Tesla tycoon later acknowledged the report on Twitter: In a separate tweet, he confirmed that Raptor production problems were the biggest potential bottleneck for future Starship flights.

— Elon Musk (@elonmusk) November 30, 2021 The dire warning may come as a surprise, given SpaceX’s apparent success. The firm was recently valued at $100.3 billion, up from $74 billion in February. That makes it the second-most valuable private company in the world, according to CB Insights, behind only China’s Bytedance. SpaceX has also continuously hit historic milestones, from becoming the first private company to successfully launch, orbit, and recover a spacecraft, to sending astronauts to the International Space Station. However, Musk says the magnitude of the Starship program isn’t fully appreciated: Musk added that both General Motors and Chrysler — then America’s biggest and third-largest automakers, respectively — declared themselves bankrupt in the Great Recession of 2008–09.

— Elon Musk (@elonmusk) November 30, 2021 Undoubtedly, Starship is a phenomenally ambitious — and expensive — project. Yet Musk’s fears of bankruptcy may not be all they seem. The comments could also pressure staff to deliver on his ambitious plans. Indeed, his memo to staff — sent the day after Thanksgiving — urged them to return to work: Whether the company is on the verge of bankruptcy or not, Musk’s message will likely have got some more labor out of his employees — and moved SpaceX closer to resolving his rocket issues.