Dean Potter, seen here in 2012, died this weekend along with Graham Hunt while they were attempting a wingsuit flight in Yosemite National Park in California. Hao Tongqian/Xinhua /Landov hide caption

toggle caption Hao Tongqian/Xinhua /Landov

In 2012, these two base jumpers wearing wingsuits were high above Chamonix in the French Alps. Cyril Duval/AP hide caption

toggle caption Cyril Duval/AP

Wingsuit Flying: Incredible Thrill, But 'No Second Chance'

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