It’s worth noting that Neatorama had this sound advice on atempting anything like this:
Unlike conventional modern â€œmagic,â€ what was involved in the underwater breathhold was not special effects or hidden technology.Â Instead, Blaine prepared using a combination of hypoxic tent training to increase his hematocrit, preloading with 100% oxygen, meditation to decrease his oxygen consumption, and hyperventilation to delay his hypercapnic response.
As a useful reference point, his 17-minute breathhold time is almost the same length as this 20-minute TED talk.Â Itâ€™s also worth noting here as an addendum that the hyperventilation (â€œpurgingâ€) he describes should not be attempted by amateurs to increase underwater breathhold time while swimming or diving.Â The technique does allow a longer breathhold, but does not provide additional oxygen, so novices can become disoriented from hypoxia and drown.
[TED Talk David Blaine: How I held my breath for 17 min]
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