Hyperventilation before underwater breath-holding can delay the urge to breathe while oxygen continues to fall, increasing the risk of sudden loss of consciousness and drowning.

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Underwater Hypoxic Blackout Prevention explains that hyperventilation lowers carbon dioxide, can delay the urge to breathe, and can allow oxygen to fall to levels at which loss of consciousness occurs underwater.

This source directly supports underwater breath-hold and hyperventilation risk. It does not by itself establish the chapter’s full list of non-water medical contraindications for intense breathwork.

The Evidence Map should keep this record narrow. The broader safety language in the chapter requires either additional cited support in a future edition or explicit treatment as conservative practice guidance rather than as a verified claim from this source.

Sources are listed according to the role they play in this claim. One source may provide direct support, another may explain a mechanism, establish a limitation, or prevent an interpretation from becoming broader than the evidence allows.

The printed book preserves the claim inside the argument that gives it meaning. These references connect the current digital record to the first-edition evidence trail.

This claim connects to the following parts of the Human OS architecture. The module labels locate the claim inside the framework; they do not imply that the research source validates the architecture itself.

This section identifies practical boundaries relevant to the claim. It does not provide individualized medical guidance.