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Their spacecraft hit a peak altitude of 875 miles (1,408 kilometers) following Tuesday's liftoff.
Isaacman became only the 264th person to perform a spacewalk since the former Soviet Union scored the first in 1965, and SpaceX's Sarah Gillis the 265th. Until now, all spacewalks were done by professional astronauts.
"We are mission complete," Isaacman radioed as the capsule bobbed in the water, awaiting the recovery team.
It was the first time SpaceX aimed for a splashdown near the Dry Tortugas, a cluster of islands 70 miles (113 kilometers) west of Key West. To celebrate the new location, SpaceX employees brought a big, green turtle balloon to Mission Control at company headquarters in Hawthorne, California. The company usually targets closer to the Florida coast, but two weeks of poor weather forecasts prompted SpaceX to look elsewhere.
This image made from SpaceX video shows the four-member crew including tech entrepreneur Jared Isaacman, third left, seated in its capsule as they wait to get off the capsule after it landed in the Gulf of Mexico near Florida's Dry Tortugas early Sunday, Sept. 15, 2024. Credit: SpaceX via AP 
This black and white, thermal image made from SpaceX video shows its capsule, center, carrying tech entrepreneur Jared Isaacman with his crew after it reached the Gulf of Mexico near Florida's Dry Tortugas early Sunday, Sept. 15, 2024. Credit: SpaceX via AP 
This black and white, thermal image made from SpaceX video shows its capsule, center bottom, carrying tech entrepreneur Jared Isaacman with his crew minutes before it reached the Gulf of Mexico near Florida's Dry Tortugas early Sunday, Sept. 15, 2024. Credit: SpaceX via AP 
This image made from a SpaceX video shows the start of the first private spacewalk led by tech billionaire Jared Isaacman Thursday Sept. 12, 2024. Credit: SpaceX via AP
During Thursday's commercial spacewalk, the Dragon capsule's hatch was open barely a half-hour. Isaacman emerged only up to his waist to briefly test SpaceX's brand new spacesuit followed by Gillis, who was knee high as she flexed her arms and legs for several minutes. Gillis, a classically trained violinist, also held a performance in orbit earlier in the week.
The spacewalk lasted less than two hours, considerably shorter than those at the International Space Station. Most of that time was needed to depressurize the entire capsule and then restore the cabin air. Even SpaceX's Anna Menon and Scott "Kidd" Poteet, who remained strapped in, wore spacesuits.
SpaceX considers the brief exercise a starting point to test spacesuit technology for future, longer missions to Mars.
This was Isaacman's second chartered flight with SpaceX, with two more still ahead under his personally financed space exploration program named Polaris after the North Star. He paid an undisclosed sum for his first spaceflight in 2021, taking along contest winners and a pediatric cancer survivor while raising more than $250 million for St. Jude Children's Research Hospital.
For the just completed so-called Polaris Dawn mission, the founder and CEO of the Shift4 credit card-processing company shared the cost with SpaceX. Isaacman won't divulge how much he spent.
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