They do, but it is not as big of a threat as compared to normal scuba divers. Because they hold their breath, they don’t have to worry about the effects of the higher oxygen concentration that normal scuba divers breathe in from their tanks. However, if they rise too quickly from too great of a depth, it is still possible for the oxygen to absorb into their tissues causing the bends.
Of course, but not to the same degree as SCUBA divers. But with freedivers reaching hundreds of feet below sea level, who knows the back-breaking pressures that come with that territory. Hope I helped, and have a green day!
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