Buzz Aldrin, who became the second person to walk on the moon in 1969, has been medically evacuated from the South Pole.
The 86-year-old former astronaut was part of a tourist group visiting Antarctica when his “condition deteriorated,” according to White Desert, the luxury tourism operator hosting the trip.
Aldrin was evacuated on the first available flight from the South Pole to McMurdo Station, a research center run by the National Science Foundation.
The travel company said he was in stable condition when he was transferred to the medical team.
According to the National Science Foundation, Aldrin will be on a flight to New Zealand “as soon as possible.”
Aldrin expressed his excitement for his Antarctica trip in several recent photos on social media.
On Tuesday, the Apollo 11 astronaut shared a snap of himself standing in front of a plane with his luggage, wearing a “Destination Mars” T-shirt.
“South Pole here I come!” he captioned the picture.
Additional shots featured other members of the tour group before they boarded their flight.
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On Sunday, Aldrin posted a picture in which he’s trying on gloves while wearing jeans and a “Get Your Ass to Mars” T-shirt.
“I could be a little underdressed for Antarctica. Although I tend to be hot blooded,” he wrote.
Aldrin has stayed active in recent years, making guest appearances on The Big Bang Theory and Hell’s Kitchen and competing on season 10 of Dancing with the Stars.