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That's why there's a saying to never dive alone when freediving, cos even when you blackout, most of the time you will be fine as long as some one is there to safety you up to surface in time. Though Ive never experienced a blackout before, and I intend not to! It's fairly common and not as deadly as it seems, in the competitive freediving scene at least ☝️

Hope you never have any problem like that. Be careful man!