What manuever is normally performed to prolong the duration of a breath-hold dive?

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Voluntary hyperventilation involves breathing deeply and rapidly before a breath-hold dive. This helps to decrease the levels of carbon dioxide in the lungs, which can prolong the time before the urge to breathe becomes too strong. However, it is important to note that this maneuver can be dangerous if not done properly, as it can lead to shallow water blackout.

What Manuever Is Normally Performed to Prolong the Duration of a Breath-Hold