As Mars colonization inches ever closer to becoming a reality, some have argued that the ability to afford a ticket to the Red Planet is a luxury afforded only to the wealthiest members of society. Billionaire Elon Musk has said it’ll run potential Mars inhabitants traveling with his company SpaceX hundreds of thousands of dollars to get there. But in a new interview, he rebuffed the assertion that a one-way ticket to Mars is an easy ticket out for the rich.

The comments were part of an interview with the SpaceX and Tesla CEO that will air Sunday evening in the final episode of Axios’ four-part limited documentary series on HBO. In a clip from the interview, Elon Musk hinted that advancements by his company for Mars colonization have been notable and said there’s a “70 percent” chance that he heads to the Red Planet himself.