May 14, 2011 "Challenges of extreme suffocation" held in Zhangjiajie Baofeng Lake area, this PK contest started between Stig Avall Severinsen and David Merlini,The world's two original, one from Denmark Stig Avall Severinsen and one from Italy David Merlini.the final result is that Italy David Merlini wins the game.results is 20 minutes and 55 seconds.This result not only of his set a Guinness World Record for underwater breath holding, and become the best results.
Baofeng lake situated in Suoxiyu Natural Reserve, it seats in the half way of eagle mountain, but not a natural lake. in 1970’s people fill the small faults of the lake with concrete to store water and .water level come up and beautiful lake takes shape, boat tour in the lake gives a lot of fun with the folk songs by girls in the boat, the tourists are expected to interact with the folk song girls by crossing singing, permanent waterfall at the entrance is a wonder.