Are these people nuts? Check out these World Record freediving video clips and see why this is one of the most dangerous sports.Holding their breath while excersizing underwater, freedivers dive longer and deeper, hoping to better their time and depth. An extreme form of snorkeling, freediving is a technical sport which pushes the limits of human ability and sometimes defies scientific laws. Freediving is also known as one of the most dangerous sports. Many freedivers and support divers have suffered severe accidents during record attempts including technical failures and fatal blackouts.See more extreme sports videos at AdventureImagery.com, a footage library specializing in adventure and extreme sports stock footage licensed royalty free for use in your own productions.