Underwater Hockey is a form of hockey played at the bottom of large swimming pools. Players wearing snorkels use a small stick to push a weighted puck along the bottom of a pool, with the intention of putting it into the opposing team's goal.

Underwater hockey resembles conventional hockey in many ways. Two teams of up to ten players each try to maneuver a puck into the opposing team's goal; however, the game is played underwater and there is no contact allowed.

To score more points than the opposing team by the end of regulation time.

Before the start of play the puck is placed in the middle of the pool, and the players wait in the water, touching the wall above the goals they are defending. At the start-of-play signal, in-play members of both teams are free to swim anywhere in the play area and try to score by sending the puck into the opponents' goal. Play continues until either a goal is scored, or a break in play is signaled by a referee. Games consist of two halves, typically ten to fifteen minutes in length (depending on tournament rules; 15 minutes at world championship tournaments) and a short half time interval. At half time the two teams switch ends.

Underwater hockey was created in 1954 by Alan Blake of the Southsea Sub-Aqua Club and first played by the club in Portsmouth, England. The sport was originally known as "Octopush" and is still referred by that name in the United Kingdom. The sport was developed as a way to retain interest in the club during the winter months when the sea was too cold to dive in. It first reached North America in 1962 and is now played by 44 teams in 17 countries.

Diving Mask
Fins
Glove (for stick hand)
Goals
Lead Hockey Puck
Mouth Guard
Polo-style Cap
Snorkel
Speedo
Stick (usually no more than 350mm long)

Underwater hockey resembles conventional hockey in many ways, so an understanding of the sport is beneficial, but not required. Because the sport is played underwater, players should be strong swimmers and in good physical condition to be able to properly compete.

http://en.wikipedia.org/wiki/Underwater_hockey