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The Crew Dragon made a splashdown landing in the Gulf of Mexico just after 2:45 pm ET.
The Crew Dragon made a splashdown landing in the Gulf of Mexico just after 2:45 pm ET.
After a brief hangup caused by wayward fumes given off by propellant, the Crew Dragon opened its hatch and Behnken and Hurley took their first steps into Earth's gravity after spending two months in the zero-G environment of space.
Behnken waved to the cameras before heading to his medical check up. Hurley followed shortly after and flashed a thumb's up.
"Thanks for doing the most difficult part and the most important part," Hurley said to mission control shortly before departing.
Spending two months in microgravity, then enduring a jarring trip home, can make readjusting difficult.
NASA astronaut Garret Reisman, who helped SpaceX develop Crew Dragon, said it took him about 15 minutes to sit up and another 15 to be able to stand after he returned to Earth after Space Shuttle missions.
The Crew Dragon recovery team has detected small amounts of NTO, or nitrogen tetroxide, a potentially toxic propellant used in the capsule's onboard rocket engines.
The levels aren't high enough to be dangerous to humans, according to SpaceX and NASA officials. And the air inside the spacecraft is clean.
But the safety teams want to put the issue to bed before the astronauts are allowed to disembark.
At the ship's rear is a large rig that has plucked the spacecraft out of the ocean and nestled it in an onboard dock, nicknamed the Dragon's nest.
Soon after it's on board, Behnken and Hurley will disembark and take their first steps back onto their home planet.
Two small boats swooped in immediately after splashdown. One is checking to make sure there are no toxic fumes around the Crew Dragon capsule. The other is working to drag the spacecraft's parachutes out of the ocean.
Hurley and Behnken will disembark after their vehicle is safely on board. That's expected to happen in less than an hour.
The first words from mission control to the astronauts were a humorous welcome home: "Thank you for flying SpaceX."
The astronauts had a cheerful message for their flight doctors waiting to check them out as well:
"Let them know we're feeling good."
The Crew Dragon capsule has splashed down into the Gulf of Mexico, finishing off the hardest part of today's journey.
As expected, mission control has lost communications contact with the Crew Dragon capsule. This is common for spacecraft going through the extreme conditions of reentry, when the dramatic heat and buildup of plasma briefly interfere with radio waves used for communication.
The blackout is expected to last six minutes.