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Also known as “The Cube”, Jump Blue (JB) Apnoea is one of the signature disciplines of CMAS who are the sole officiators of world records in this style of freediving. Athletes compete to swim as far as they can around a 15x15m square at a depth of between 5 and 15m in open water.

I first came across this question from by a very organised, very talented level 2 student (German, naturally) who not only wanted to know exactly why he felt much better on the ascent, but