Of all the scenes in J.R.R. Tolkien's The Hobbit, Peter Jackson cites the escape from the elves as one of his favorites. So in The Hobbit: The Desolation of Smaug, the director went to great lengths to make Bilbo and the dwarves' wine-barrel-enabled getaway from Thranduil's realm into an epic seven-minute action sequence. How'd he do it? Watch the video above to see how Jackson and his team used 98 hours of footage from aerial shots, green-screen sets, live-action shoots, and complex CG environments to make the final white-knuckle scene.