iStockphoto / Alessandro De MaddalenaAudio By CarbonatixA long distance swimmer in California required medical rescuing overnight after being attacked by what was assumed to be a white shark during a swim from Catalina Island to the mainland. The Catalina Island channel is a world renowned spot for long distance swimmers. Great White Shark Attack Off Catalina Island, CaliforniaThe unidentified swimmer is believed to be between 50-55 years old. The Mainland to Catalina Island record was set by Penny Lee Dean in 1976 at 07:15:55. Grace van der Byl holds the Catalina Island to Mainland record at 07:27:25, a record set in 2012.