A daredevil duo set the the Guinness World Record for highest base jump from the tallest building by leaping off the Burj Khalifa.

The 4K YouTube video shows Soul Flyers World Champions Vince Reffet and Fred Fugen jumping from a custom-made platform at the very top of the spire.

Standing at 2,722 feet tall, the Burj Khalifa dwarfs the rest of Dubai's cityscape. Emirates247 reports that Reffet and Fugen had to endure an intense week of training in Switzerland, jumping off Lauterbeunnen mountain, which stands at a similar height.

Take a deep breath before watching.

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