Largest underwater hockey tournament

According to Official Guinness Records,

The largest underwater hockey tournament was the Senior Open Division of the 25th New Zealand Secondary Schools' Underwater Hockey Championships, involving 174 participants across 18 teams, in Christchurch, Canterbury, New Zealand, from 2-6 September 2009. The overall championships consisted of 564 total players on 62 teams across four competitive divisions: Junior Girls, Junior Open, Senior Girls and Senior Open.
The tournament consisted of four competition groups: Junior Girls (14 teams), Junior Open (13 teams), Senior Girls (17 teams) and Senior Open (18 teams).

For a complete list of 2009 records, please visit 2009 Guinness Records in New Zealand.

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