The terrible, true story of what was, at the time, the deadliest summit attempt on Mount Everest is now being told in the new film, "Everest," which features an all-star cast and breathtaking special effects.

In the clip below, premiering today exclusively on Moviefone, climber Scott Fischer (Jake Gyllenhaal) finally reaches the top of the titular mountain, and the achievement literally takes his breath away.

As Fischer fights for air in the notoriously low-oxygen environment, he chats with fellow climber Rob Hall (Jason Clarke), the leader of another expedition who's also just reached the top.

But while the scene in question is lighthearted -- the pair joke about who among their group has fallen behind, and who will make it to the summit first -- the circumstances that await them are anything but. As chronicled in Jon Krakauer's famous book, "Into Thin Air" (Krakauer was part of Hall's group, on assignment for Outside magazine at the time), the expeditions are soon caught in a horrific blizzard, and many climbers perish as a result.

It's a chilling tale, but one that seems to be in good hands with Gyllenhaal and co. at the helm. "Everest" also stars Josh Brolin, John Hawkes, Robin Wright, Emily Watson, Keira Knightley, and Sam Worthington.

It's due in theaters on September 18.
Everest- EXCLUSIVE Clip No. 1
Everest Movie Poster
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On the morning of May 10, 1996, climbers (Jason Clarke, Josh Brolin) from two expeditions start their... Read More