The SpaceX founder was speaking Thursday when he made the stark prediction Musk has already said he hopes to get humans on Mars by 2026 But a barefoot Musk warned Thursday: 'Going to Mars reads like that advert for Shackleton going to the Antarctic. You know it is dangerous, it's uncomfortable' 'You might not come back alive but it is a glorious adventure,' Musk added He said: 'Yeah, honestly a bunch of people will probably die in the beginning' SpaceX brought spaceflight back to America last May, launching NASA astronauts from Kennedy Space Center to the International Space Station On Saturday SpaceX's third crew capsule in less than a year arrived on the ISS