This video documents Wim Hof having a guest hold his breath underwater, with an explicit warning attached: this isn't part of the Wim Hof Method itself, it should only be done under professional supervision, and above all it should never be replicated alone at home — that's the single most important warning in this whole batch, not a caption footnote.

noli's read

The danger mechanism is well established in aquatic sports medicine: voluntary hyperventilation before a breath-hold drops CO2 without adding usable oxygen, which delays the urge to breathe without delaying the point of losing consciousness from lack of oxygen — the body gives no warning before blacking out. This phenomenon, called shallow water blackout, was formally cited in a Wim Hof Method-linked death ruled on by a Singapore coroner in 2022, and investigative journalist Scott Carney (a former insider, author of 'What Doesn't Kill Us') has documented dozens of deaths tied to practicing this breathing in or near water. The video itself acknowledges the risk and warns explicitly — which is the most honest and useful part of the post. The title's implicit promise ('becomes Superman,' 'insane PB'), on the other hand, rests on a single-person demonstration (Eddie Hall) with no controlled measurement or comparison, so nothing here supports generalizing an athletic-performance boost from this video. Verdict: unproven for the claimed performance boost — but the safety warning it carries is fully grounded and should be taken literally: never do Wim Hof-style breathing in or near water without professional supervision.

the sources

No named source held this one up — that absence is part of the verdict.