NASA astronauts are set to return to Earth on Crew Dragon Endeavour

The SpaceX Crew Dragon Endeavour became the first commercial spaceship to send astronauts into space.
2:24 | 08/01/20

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Transcript for NASA astronauts are set to return to Earth on Crew Dragon Endeavour
and the preparations in space for the journey home. Nasa astronauts on board the international space station are readying crew dragon for the return to Earth and ABC's gio Benitez is in Texas where he's been following the mission. Gio, good morning to you. Reporter: Hey, Dan, good morning to you from the Johnson space center in Houston. You know, the astronauts got up earlier than we did, 3:00 this morning, for this next pivotal moment in this historic mission. Liftoff of the falcon 9 and crew dragon, go, nasa, go, spacex. Reporter: Just two months ago the crew dragon became the first commercial spaceship to send astronauts into space. Now nasa's Bob Behnken and Doug hurley are set to return to Earth on the dragon even as hurricane Isaias threatens their splashdown. They spoke to us from the international space station Friday join the by commander Chris Cassidy. Are you at all concerned that this storm may be too close for comfort? Every six hours we'll get another forecast, sort of an update so watching those closely. Reporter: If the dragon undocks tonight it must start its journey to Earth and the clock will be ticking. They have just 48 hours' worth of oxygen on board once it undocks, then tomorrow splashdown. The ground teams are fully aware of the challenges of the water landing and what it does to the human body and we'll take it from there. We've exercised very hard while we've been up here. Reporter: This test flight setting the stage for Behnken's own wife, decorated astronaut, Megan Mcarthur. What tips do you have for her? I'll definitely have advice about living inside of dragon but it'll be hard to tamp down all the excitement she has with any suggestions I have. Reporter: She really is excited. And nasa's flight director said overnight he's feeling really good about a splashdown tomorrow somewhere in the gulf of Mexico in part because that hurricane is actually making better weather there for that splashdown in the gulf of Mexico. This will be the first American splashdown in 45 years. Now, if they delay the undocking, they will try again on Monday. I really feel for that astronaut. My wife loves taking advice from me. Sometimes I say to her, how is it to be married to your spiritual leader? Doesn't go down well. And she ignores you. No, it does not. I imagine most wives would ignore comments like that, right? We will and right back with our

This transcript has been automatically generated and may not be 100% accurate.

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