The REAL indoor snorkel battle extreme AQUATHLON looks like it is being picked up by CMAS as a governing body. Not sure why I thought it was worth posting, I had just stumbled accross it.

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An aquifer is a water bearing layer of rock or soil. Aquifers are separated by impermeable layers of rock or clay called an aquitard. Aquitard, however may sound a bit offensive to some, and therefore we will be changing the name to Aquachallenge.