>> july 11, 2011. aerial dancer ava sharp prepares for one of the most dangerous performances of her life. >> i knew i would perform there. it wasn't a question of if. it was a matter of when. >> on the williamsburg bridge, it links manhattan with brooklyn. on the evening of the performance ava is one of a few people with a camera on that bridge. >> a friend of mine e-mailed me the day of her performance and said come out today to the bridge. something amazing is going to happen. i brought my camera with me not really knowing what to expect. >> sharp and a fellow performer carrying a camera scale the tower in about seven minutes where she attaches her silk cloud swing 300 feet above the deck. >> the silk cloud swing is a double trapeze made out of silk. it opens so you can twist, spin side to side, back and forth. it basically gives an incredible versatility. >> once the swing is securely rigged, sharp begins her dance.