Two adventurers in the United States have begun a helium-filled mission to fly across Oregon and Idaho and into Montana on a pair of chairs tied to balloons.
Volunteers filled 350 red, white, blue and black balloons with helium and tied them to a homemade rig.
Besides a GPS, satellite phone, and parachutes, Kent Couch and Fareed Lafta are carrying an air rifle to shoot out enough balloons to come back to earth when the time is right.
They are expecting to float at 15,000 to 18,000 feet where temperatures drop to around -18C.
The balloonists gave their first report via radio shortly following takeoff.
It's very peaceful. We have a lot of clouds out in the distance. It's probably around 7C.
The current record listed by Guinness for the longest duration flight by helium balloons is held by Jonathan Trappe for a flight of 13 hours, 36 minutes, 57 seconds over North Carolina in April 2010.