Elon Musk could be preparing to invest $100 million of his own money to fund Neuralink, the start-up the billionaire tycoon hopes will one day produce technology capable of connecting the human brain to a computer, and save us from AI overtake.

A filing with the US Securities and Exchange Commision (SEC) confirms that Neuralink already has $27 million in funding, and Musk took to Twitter Friday to shoot down suggestions that the company was looking for outside investors.

While Musk himself has been equivocal about the filing, Bloomberg stated that he "has taken steps to sell as much as $100 million in stock to fund the development."

Neuralink remains a mystery to observers of the tech industry. The company's website simply states that it is "developing ultra high bandwidth brain-machine interfaces to connect humans and computers."