Jeb Corliss is known as the world’s best wingsuit pilot and BASE-jumpers and on September 28, 2013, he successfully completed what he says, ‘was the hardest thing I’ve ever done’. Corliss jumped out of an airplane and flew through a narrow crack in the Flying Dagger in China’s Jianglang mountains (Zhejian Province) at approximately 100 mph (160 km/h). According to Twisted Sifter, the fissure is only about 60 feet (18 m) wide at the top and 15 feet (4.5 m) at the bottom. Continue reading for more.

The stunt was extremely technical and saw Jeb fly more than 900 ft through the mountain’s “three fingers”. After emerging through the crack, Corliss had to deploy his parachute at just 300 ft of altitude. Here’s what Jeb has to say: “Literally split second every single step of the way. And when I landed at the landing area and I wasn’t hurt, I was like, ‘that is about as close to as impossible…I cannot believe that just happened.”