Underwater Hockey - WT?

I was oblivious to this sport until tonight when the under water hockey players joined me in the pool. I had no idea that there was a game going on below me until I got out. I was doing my laps and all these people kept getting into the pool with their head gear on and flippers and disappearing. By the amount of bags being dumped around I should have twigged. But oh no, Id managed to complete all my exercise although I did end up with a few gob fulls of water coz it was really choppy and people were swimming around on the bottom of the pool, which really intrigued me as it looks so poetic with all the curvy movements they were doing. Some of them were breaching right in front of me which made me cranky but I was determined to finish the full 30 laps. When I finished a man who put on his cozy right next to me then sat down to put on his flippers. I asked him "whats with all the head gear ? he said "we have an underwater hockey game underway at the moment and you have been swimming right through the middle of it doing your laps. Whoops!!! I thought he was shitting me and he said its an olympic sport handed me a large face mask and said go down and check it out... Alrighty then!!!