Expanding on why this is dangerous, doing these breathing exercises in water is bad because the drive to breath (excess co2 in blood) can be postponed via hyper

Expanding on why this is dangerous, doing these breathing exercises in water is bad because the drive to breath (excess co2 in blood) can be postponed via hyperventilating beforehand, but this means you can still pass out from a lack of oxygen in the blood. If this happens while you are in a bathtub, you will drown.