

Counter-Errorism in Diving: Applying Human Factors to Diving
Gareth Lock at The Human Diver
Human factors is a critical topic within the world of SCUBA diving, scientific diving, military diving, and commercial diving. This podcast is a mixture of interviews and 'shorts' which are audio versions of the weekly blog from The Human Diver.
Each month we will look to have at least one interview and one case study discussion where we look at an event in detail and how human factors and non-technical skills contributed (or prevented) it from happening in the manner it did.
Each month we will look to have at least one interview and one case study discussion where we look at an event in detail and how human factors and non-technical skills contributed (or prevented) it from happening in the manner it did.
Episodes
Mentioned books

Sep 17, 2025 • 6min
SH209: You're biased, I'm biased, We are all biased!
In this episode, we explore how cognitive biases like hindsight bias, severity bias, outcome bias, and confirmation bias impact our ability to learn from accidents and incidents, both in diving and beyond. Using recent Red Sea liveaboard tragedies as a backdrop, we discuss why some events seem “obvious” only in hindsight, how severe outcomes lead to harsher judgments, and the danger of stopping investigations once a single cause is found. By understanding how biases shape our reactions, we can shift from judgment to learning, asking better questions and uncovering the deeper factors behind decisions and actions.
Original blog: https://www.thehumandiver.com/blog/we-are-all-biased
Links: BBC articles: https://www.bbc.com/news/articles/cp3z0k72yw3o
https://www.bbc.com/news/articles/c87dxx41lvvo
Sea story sinking news report (in German): https://taucher.net/diveinside-safariboot_sea_story_im_roten_meer_gesunken-kaz9391
List of Red Sea dive boat sinkings: https://matthiasmunz.de/Sunken_Diving_Safari_Boats_Egypt/
Tags: English, Cognitive Biases, Decision Making, Decision-Making, Gareth Lock, Hindsight Bias, Jenny Lord

Sep 13, 2025 • 8min
SH208: The Lost Fin: A Lesson in Situation Awareness
In this episode, we dive into the story of a diver’s lost fin to explore the challenges of decision-making, task fixation, and situation awareness underwater. Through the lens of a training dive gone awry, we uncover how both students and instructors can fall into cognitive traps, focusing narrowly on immediate tasks while losing sight of broader risks. Highlighting the importance of structured debriefing, reflective discussions, and the DEBrIEF model, we discuss how understanding "how it made sense" in the moment can lead to better mental models and a culture of learning in diving. This tale is a reminder that diving isn’t just about technical skills—it’s about building awareness, fostering teamwork, and learning from every experience.
Original blog: https://www.thehumandiver.com/blog/the-lost-fin-a-lesson-in-situation-awarness
Tags: English, Andrzej Górnicki, Debrief, Decision-Making, Hindsight Bias, Situation Awareness

Sep 10, 2025 • 7min
SH207: Change your Language. Change the World
This podcast dives into the analysis of a cave diving fatality at Cenote Nariz in Mexico, based on a detailed report by the Creer Line and Safety Committee. The incident highlights critical lessons for divers in all environments, emphasizing the importance of understanding human factors, decision-making, and context in adverse events. While the exact cause of the diver's seizure remains uncertain, likely contributors include hypercapnia or hyperoxia, exacerbated by equipment and procedural factors. Broader lessons focus on fostering safety cultures, avoiding the normalization of risk, maintaining equipment rigor, and embracing systems that encourage learning without blame. Join us to explore how these insights can improve safety and awareness across diving disciplines.
Original blog: https://www.thehumandiver.com/blog/change-your-language-change-the-world
Links: Podcast ‘Hidden Brain’- are our memories real?: https://hiddenbrain.org/podcast/are-your-memories-real/
Blog about Agency: https://indepthmag.com/the-role-of-agency-when-discussing-diving-incidents-an-adverse-event-occurs-an-instructor-makes-a-mistake/
Learning Reviews: https://www.thehumandiver.com/blog/learning-reviews-in-diving
Podcast ‘How did it make sense’: https://www.humaninthesystem.co.uk/hits-hdims
How language changes the way we think TED talk: https://www.youtube.com/watch?v=RKK7wGAYP6k
The Power and Pitfalls of Language in Accident Investigation: https://nescacademy.nasa.gov/video/2c1ea826930946ff8659621ee83bec931d
The Power Of Language: https://mindsetleadership.co.uk/2023/09/01/the-power-of-language/
Tags: English, Cognitive Biases, Communication, Gareth Lock, Incident Analysis, Incident Reporting

Sep 6, 2025 • 22min
SH206: Single Diver Fatality in Cenote Nariz, 3 February 2024. CREER Report
This podcast dives into the analysis of a cave diving fatality at Cenote Nariz in Mexico, based on a detailed report by the CREER Line and Safety Committee. The incident highlights critical lessons for divers in all environments, emphasizing the importance of understanding human factors, decision-making, and context in adverse events. While the exact cause of the diver's seizure remains uncertain, likely contributors include hypercapnia or hyperoxia, exacerbated by equipment and procedural factors. Broader lessons focus on fostering safety cultures, avoiding the normalization of risk, maintaining equipment rigor, and embracing systems that encourage learning without blame. Join us to explore how these insights can improve safety and awareness across diving disciplines.
Original blog: https://www.thehumandiver.com/blog/mx-singlefatality-report
Links: CREER: https://creer-mx.com/
Accident report: https://creer-mx.com/wp-content/uploads/2024/04/Single-Diver-Fatality-in-Cenote-Nariz-on-3-February-2024.pdf
A Just Culture is not a 'just do it' culture: https://www.thehumandiver.com/blog/a-just-culture-is-not-a-just-do-it-culture
Counterfactuals: I would have lined in: https://www.thehumandiver.com/blog/counterfactuals Why is it so hard to admit our mistakes?: https://www.thehumandiver.com/blog/why-is-it-so-hard-to-admit-to-our-mistakes
Tags: English, Cave Diving, Gareth Lock, Incident Analysis, Just Culture

Sep 3, 2025 • 11min
SH205: What one thing...
This episode explores the power of small, intentional changes to improve teamwork, leadership, and performance in diving. Drawing from the Human Diver team's experience with a new training platform, we discuss how focusing on key skills like communication, task prioritization, and role clarity can create significant improvements. By embracing curiosity, running effective debriefs, sharing stories, and taking actionable steps, we can build safer, more effective diving practices. Change starts with small actions, and owning that change is the key to lasting impact.
Original blog: https://www.thehumandiver.com/blog/what-one-thing
Links: Marginal gains: https://jamesclear.com/marginal-gains
DEBrIEF guide: https://www.thehumandiver.com/debrief
If Only… documentary: https://www.thehumandiver.com/ifonly
The Human Diver blogs: https://www.thehumandiver.com/blog
Contact Gareth: https://www.thehumandiver.com/contact
The Essentials class: https://www.thehumandiver.com/HFiD-Essentials
Level 1 Webinar: https://www.thehumandiver.com/hfid-level-1-webinar-series
Face-to-Face program: https://www.thehumandiver.com/hfid-level-2
2 relevant blogs: https://www.thehumandiver.com/blog/knowledge-is-not-enough-we-must-apply
https://www.thehumandiver.com/blog/the-power-of-one
Tags: English, Debrief, Decision-Making, Gareth Lock, If Only, Just Culture, Leadership

Aug 30, 2025 • 11min
SH204: Follow me! Trust me! I am your Leader!
Leadership in diving is critical for navigating uncertain situations and achieving successful outcomes, whether you're teaching students, leading a dive project, or running a dive center. Drawing lessons from Ernest Shackleton's legendary leadership and modern theories of influence, this episode explores how effective leaders go beyond authority and management to inspire trust, foster psychological safety, and build personal connections. We discuss six key strategies for diving instructors, including defining a clear purpose, embracing humility, managing conflict constructively, learning from mistakes, adapting leadership styles, and showing genuine care for others. Tune in for actionable insights to enhance your leadership in the water and beyond.
Original blog: https://www.thehumandiver.com/blog/follow-me-trust-me-i-am-your-leader
Links: Building psychological safety in a team (part 1): https://www.thehumandiver.com/blog/team-building-psych-safety-1
Trust is based on 1:1 relationships: https://www.forbes.com/sites/shanesnow/2020/04/27/this-common-approach-to-earning-trust-completely-backfires-on-leaders/?sh=515264702fcb
Goodheart’s law: https://humanisticsystems.com/2019/10/24/shorrocks-law-of-limits/
Double-loop learning: https://en.wikipedia.org/wiki/Double-loop_learning
The Ladder of Inference: https://thesystemsthinker.com/the-ladder-of-inference/
Self Discovery techniques: https://spectrumofteachingstyles.org/index.php?id=21
The Myth of the Advert: https://www.smithsonianmag.com/smart-news/shackleton-probably-never-took-out-an-ad-seeking-men-for-a-hazardous-journey-5552379/
Tags: English, Communication, Gareth Lock, Leadership, Psychological Safety, Teamwork

Aug 27, 2025 • 9min
SH203: The Importance of Psychological Safety in Debriefs
Debriefs are vital for learning and improvement, but making them effective can be challenging. This episode explores how the DEBrIEF framework, inspired by aviation and human factors experts, provides a structured approach to debriefing that fosters psychological safety. We discuss the importance of vulnerability, showing that even experienced divers make mistakes, and how leading by example encourages honest self-reflection. Real-world examples highlight how debriefs can move beyond surface-level feedback, helping teams identify areas for growth and create meaningful solutions. With the right structure and environment, debriefs can become powerful tools for continuous improvement in diving and beyond.
Original blog: https://www.thehumandiver.com/blog/the-importance-of-psychological-safety-in-debriefs
Links: The DEBrIEF model: https://www.thehumandiver.com/debrief
Jenny and Mike’s Briefing and Debriefing presentation: https://www.youtube.com/watch?v=JTM_Lh7HtmA&t=591s
Tags: English, Communication, Debrief, Gareth Lock, Psychological Safety, Teamwork

Aug 23, 2025 • 8min
SH202: Accountability? Just another word for blame?
In this episode, we explore the meaning of accountability and its role in learning and improvement. Is accountability about assigning blame, or can it be a tool for growth? We discuss the difference between backward-looking accountability, which focuses on punishment, and forward-looking accountability, which emphasizes understanding, empathy, and systemic change. Drawing on lessons from healthcare and diving, we highlight the importance of hearing multiple perspectives, addressing the needs of those impacted, and fostering a culture of responsibility over blame. By sharing real-world examples, we show how open conversations and a Just Culture approach can lead to better outcomes, stronger relationships, and meaningful improvements in safety and performance.
Original blog: https://www.thehumandiver.com/blog/accountability-or-another-word-for-blame
Links: Two approaches to accountability: https://link.springer.com/chapter/10.1007/978-94-007-1878-4_3
Accountability and Responsibility defined: https://www.researchgate.net/publication/324582377_Accountability_and_responsibility_defined
Helping people understand what happened: https://www.aamc.org/news-insights/best-response-medical-errors-transparency
Communications and Resolutions Programmes: https://communicationandresolution.org/communication-and-resolution-programs/
‘Work as Imagined’ and “Work as Done’: https://www.youtube.com/watch?v=vtgIwHrUWVQ&list=PLNXuyLsCTX6hHS3newpcROfJ_JiI27q3C&index=24&t=1s
Restorative Just Culture in The Merseyside NHS Trust: https://www.researchgate.net/publication/331284479_Restorative_Just_Culture_a_Study_of_the_Practical_and_Economic_Effects_of_Implementing_Restorative_Justice_in_an_NHS_Trust
Restorative Just Culture: http://www.safetydifferently.com/wp-content/uploads/2018/12/RestorativeJustCultureChecklist-1.pdf
Second and Thrid victims: https://youtu.be/YeSvCEpg6ew
Tags: English, Gareth Lock, Incidents, Just Culture

Aug 20, 2025 • 9min
SH201: Knowledge is not enough. We must apply. What can you do to build HF into your training or education?
In this episode, we dive into how to integrate human factors and non-technical skills into dive training and businesses. We explore the importance of understanding and applying these concepts in real-world scenarios, from effective communication to structured debriefing. Discover practical tools like blogs, workshops, and the Essentials of Human Factors in Diving course to deepen your knowledge and improve safety. Learn how abstraction, open questions, and storytelling can enhance learning and problem-solving in diving. Tune in to hear actionable advice on making human factors a core part of your diving practice.
Original blog: https://www.thehumandiver.com/blog/knowledge-is-not-enough-we-must-apply
Links: Human Factors in Diving Conference videos: https://www.youtube.com/playlist?list=PLNXuyLsCTX6hHS3newpcROfJ_JiI27q3C
Blog page: https://www.thehumandiver.com/blog
Dummies series: https://www.thehumandiver.com/blog?tag=dummies
DeBRIEF guide: https://www.thehumandiver.com/debrief
If Only…documentary: https://www.thehumandiver.com/ifonly
Gareth’s contact for Mandated Essentials class, or Affiliate link: https://www.thehumandiver.com/contact
Tags: English, Gareth Lock

Aug 16, 2025 • 6min
SH200: Why we find it so hard to say no or change...the sunk cost fallacy
In this episode, we explore why calling a dive can be so difficult and why safety ultimately allows us to dive more. We discuss how small issues and stressors, combined with the sunk cost fallacy, can lead divers to push boundaries they wouldn’t normally cross. Drawing on personal experiences, we highlight the challenges of making safety-focused decisions and why they’re essential for long-term enjoyment of the sport. Safety may seem like a small loss in the moment, but it guarantees the chance for many more dives in the future. Listen in to learn how to balance risk and reward to keep diving safe and fun.
Original blog: https://www.thehumandiver.com/blog/sunk-costs
Links: Guaranteed small loss vs possibly big loss blog: https://www.thehumandiver.com/blog/the-choices-guaranteed-small-loss-or-a-probable-large-loss-injury-or-fatality
Tags: English, Cognitive Biases, Decision-Making, Jenny Lord