Elon Musk on Monday reacted to a post in which a user mentioned that Twitter CEO is planning to build a city on Mars, and called it a "top secret".
When a user posted, "BREAKING: Elon Musk is planning to build a city on Mars. @elonmusk", Musk replied: "Top secret."
Several users expressed their thoughts on Musk's post.
While one user said, "Take me I hate it here", another commented, "make sure you give it a really good name when you found it".
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In August last year, Musk had said that he hopes for a self-sustaining city on the Red Planet in 20 years' time.
Last July, the tech billionaire had said he was optimistic that "humanity will reach Mars in your lifetime".
"Without a common goal, humanity will fight itself. The Moon brought us together in 1969, Mars can do that in the future," Musk had said.