While Musk has estimated the probability of survival during the mission by 70%.
Mr Musk was forced to step down as Tesla's chairman , but remains as chief executive, after he was accused by USA regulators of writing "false and misleading" tweets about potentially taking the company private.
But he didn't sugarcoat the reality of Mars life.
As well as that, there are enormous dust storms to contend with, and an unfortunate lack of oxygen in the atmosphere that would make walking around without space helmets on impossible - unless we work out how to engineer our own atmosphere. "Really the ad for going to Mars would be like [Sir Ernest] Shackleton's [supposed] ad for going to the Antarctic".
Earlier, the head of SpaceX promised relatively affordable flights to Mars and the formation of a self-sufficient civilization for 40-100 years. Musk said the period was extremely hard on him both intellectually and emotionally. Because people die on Mount Everest all the time.
"But if you love what you do, it (mostly) doesn't feel like work", he countered. At some point between 2022 and 2024, SpaceX might use the interplanetary BFR to launch an ultra-fast city-to-city transportation system.
Mr Musk's tweets caused Tesla's stock price to jump by more than 7% on 7 August and led to "significant market disruption", the regulator said.
But Musk remains certain he wants to go.
TheNewsGuru (TNG) reports Musk stated this in an interview with Axios on HBO on Sunday, despite a "good chance" of him not surviving either on his way or after landing.
There were even some people who showed their concern for Musk and asked exactly what was happening. "They still like doing it for the challenge".
In explaining his thinking, Musk quoted a friend who reportedly said, "the most ironic outcome is the most likely".
"If we were to wait until we could send a crew to Mars and have them return safely ... then you're getting into The Martian territory", he said.