At what point in a breath hold deep dive would the CO₂-O₂ paradox occur?

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The CO₂-O₂ paradox refers to the phenomena where, during a deep dive, the CO₂ paradox occurs on descent due to increased pressure causing more CO₂ to dissolve in the blood, leading to a reduced urge to breathe despite low oxygen levels. The O₂ paradox occurs on ascent when the pressure decreases, causing a rapid drop in oxygen partial pressure, potentially leading to hypoxia.

At What Point in a Breath Hold Deep Dive Would