"Octopush" was a sport that originated in the 1950's as a way for open-water divers to stay active during the cold winter months of England. While it's still known as Octopush in the UK, the sport is now globally referred to as Underwater Hockey.
Underwater Hockey (UWH) is a limited-contact sport in which two teams compete to maneuver a puck across the bottom of a swimming pool into the opposing team's goal by pushing it with a stick. UWH is one of the only low-impact team sports available to athletes that offers fantastic cross training benefits and is not biased against age or sex.
To learn more about Underwater Hockey rules, gear and workout drills, the Underwater Society of America (USOA) website contains useful information for new and old hockey players alike:
Watch Underwater Hockey in action here.