Counter-Errorism in Diving: Applying Human Factors to Diving1 Nov 2025

SH222: You can’t risk assess a hazard you don’t know about: DeltaP

In this episode, we explore the critical role of understanding hazards in diving and the importance of effective risk management. From the everyday threat of drowning to the more abstract risks like decompression sickness, we discuss how divers rely on equipment, training, and planning to mitigate dangers. The conversation highlights overlooked hazards like differential pressure (DeltaP), which can be deadly when misunderstood, as illustrated by tragic real-world examples. We also examine the psychology of risk normalization, emphasizing that ignorance of hazards can lead to complacency and tragedy. By raising awareness and promoting informed decision-making, this episode underscores the necessity of knowledge, preparation, and humility in diving safety.

Original blog: https://www.thehumandiver.com/blog/you-can-t-risk-assess-a-hazard-you-don-t-know-about-deltap

Links: Risk or Uncertainty blog: https://www.thehumandiver.com/blog/risk-or-uncertainty

Ignaz Semmelweis: https://en.wikipedia.org/wiki/Ignaz_Semmelweis

Video of a toy diver experiencing Delta P: https://youtu.be/uI0WOdX7cfU?t=350

Video of diver clearing lock gate: https://www.youtube.com/watch?v=MWGFEZ1tpsg

Incompetent and Unaware presentation: https://youtu.be/pGBYj1BNhvI?si=fioKreIdIS_5nX1F

Follow up video to lock gate clearance: https://youtu.be/nKp8duCNvyQ?si=-8jAyHQVGWTP8Ov7

Normalisation of risk blog: https://www.thehumandiver.com/blog/normalisation-of-deviance-not-about-rule-breaking

Differential pressure hazards in diving - Diving Information Sheet No. 13
Delta P ADCI Checklist

Tags: English, Decision-Making, Gareth Lock, Risk, Risk Management

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