The largest underwater dance class consisted of 74 students and instructors who danced for 13 minutes and 30 seconds at the Sydney Olympic Park Aquatic Centre in Sydney, NSW, Australia, on 27 October 2006.

Chris Sheedy adjudicated. http://media.smh.com.au/?source=int23059f&ie=1&rid=23059&player=wm7&rate=140&sy=smh&category=bulletin&t=1LATRN&flash=1