SH125: "Known Unknowns" - Are they considered enough in diving...?

SH125: "Known Unknowns" - Are they considered enough in diving...?

In this episode, we explore Donald Rumsfeld's "known knowns, known unknowns, and unknown unknowns" concept and how it applies to risk management in diving. Using the Johari window model of self-reflection, we discuss the importance of understanding risks that divers face, from routine (known knowns) to unpredictable (unknown unknowns). The episode highlights the role of experience, training, and non-technical skills in preventing accidents and managing emergencies. Listeners will gain insights on improving their decision-making and awareness, so they can better navigate both anticipated and unforeseen challenges in their diving journeys.

Original blog: https://www.thehumandiver.com/blog/known-unknowns-are-they-considered-enough-in-diving

Links: Johari Window: https://en.wikipedia.org/wiki/Johari_window

Dunning Kruger effect: https://www.thehumandiver.com/blog/incompetent-and-unaware-you-don-t-know-what-you-don-t-know

Experience blog: https://www.thehumandiver.com/blog/complacency-the-silent-killer-but-it-s-not-that-simple

Charles Perrow, Normal Accidents: https://en.wikipedia.org/wiki/Normal_Accidents

Parker Turner’s cave collapse: https://www.sciencedaily.com/releases/2015/09/150901121005.htm

Aqaurius Project fatality: https://en.wikipedia.org/wiki/Dewey_Smith

Tags: English, Gareth Lock

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Avsnitt(314)

SH314: 5. Human Factors as an Operating System

SH314: 5. Human Factors as an Operating System

In this episode, Brent Webb explores the idea that Human Factors should be more than a collection of concepts or courses—it can become the “operating system” of an organisation. Drawing on his experie...

14 Okt 7min

SH313: 4. Am I Enough?

SH313: 4. Am I Enough?

In this episode, Connor Tate shares her experience of attending the Human Factors in Diving Conference while struggling with imposter syndrome as a researcher with limited diving experience. Despite u...

10 Okt 9min

SH312: Your Body Can't Cash the Cheque Your Ego Is Writing

SH312: Your Body Can't Cash the Cheque Your Ego Is Writing

We explore how capable, motivated divers can gradually push beyond safe limits when their environment rewards risk-taking and treats near misses as successes. Using the story of a young technical dive...

7 Okt 16min

SH311: 3. Don’t Wait - Learn From Everyday Work Using HOP Principles

SH311: 3. Don’t Wait - Learn From Everyday Work Using HOP Principles

This episode explores Human and Organizational Performance (HOP), an approach to safety that starts with the idea that people will always make mistakes, so we should focus on understanding why decisio...

3 Okt 6min

SH310: 2. More Than a Deep Dive: What a WWII Bomber Recovery Can Teach Us About Human Factors

SH310: 2. More Than a Deep Dive: What a WWII Bomber Recovery Can Teach Us About Human Factors

This episode explores what really makes complex technical diving successful: not just helium, decompression and equipment, but the people using them. Using the recovery of the WWII B-24 Liberator Tuls...

30 Sep 8min

SH309: Change around Safety Culture is Really Hard

SH309: Change around Safety Culture is Really Hard

In this episode, Gareth Lock reflects on why improving diving safety requires more than telling people to follow the rules. Drawing on his experience in aviation, diving, and safety science, he explai...

23 Sep 14min

SH308: We Know, and We Say Nothing

SH308: We Know, and We Say Nothing

This episode explores why experienced divers still die in situations that seem predictable, using the tragic 2026 Maldives cave accident as a starting point. It looks at how outcome bias, the normalis...

16 Sep 17min

SH307: 1. The 2026 HF in Diving Conference - What Did You Miss?

SH307: 1. The 2026 HF in Diving Conference - What Did You Miss?

This episode explores how a restorative just culture can help the diving community respond to incidents in a way that promotes learning rather than blame. Instead of focusing only on who broke the rul...

9 Sep 15min

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