Adventurers preparing to cross the Atlantic in a hydrogen balloon | USA TODAY 

Three adventures plan to embark on the first trans-Atlantic flight of a hydrogen balloon.
RELATED: Hot air balloon carrying passengers safely lands on busy highway
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The adventurers - an American, a Brit and a Swede in their 60s and 70s - shared details of the upcoming trip with USA TODAY ahead of any other U.S. news outlet. The men talked about the biggest dangers they'll face, the safety measures they're taking and how they plan on navigating such tight quarters for upwards of 120 hours.
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