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This is for if you fart in the pool. If they reach the surface, people think it is you breathing out. Here you can fart unnoticed because of the bubbles that are already there. All the bubbles surrounding you will cover it up. Also, nobody can smell your fart underwater!
If you have to flatulate in the pool, get out of the pool and into the bathrooms/change rooms. Splash to hide those rising bubbles. Dive to the bottom (or close to the bottom) of the deep end and then swim away before the bubbles reach the surface. Quickly head to the Jacuzzi. Jump in the pool, and as soon as you're in the water, fart!