

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
Apr 16, 2025 • 8min
SH165: “You can lead a horse to water, but you can’t make it drink.” Or can you..?
In this episode, we explore the critical role of leadership and decision-making in diving safety, using a real-life story about a young instructor, “Jack,” who made a risky dive on a rebreather he wasn’t certified to use. Despite his confidence, Jack’s actions reflect dangerous cognitive biases like overconfidence, outcome bias, and normalization of deviance, shaped by a culture of cutting corners in his early training. Through this cautionary tale, we highlight the importance of setting the right example as dive leaders, understanding the consequences of our actions, and promoting a safety-first mindset. Tune in to learn why responsible leadership and listening to feedback are vital for creating a safer diving community.
Original blog: https://www.thehumandiver.com/blog/lead-a-horse-to-water
Tags: English, Bart Den Ouden, Decision Making, Situation Awareness
Apr 12, 2025 • 11min
SH164: Plan to fail safely – Part 2: Passing the test doesn’t say it all
In this episode, we explore how listening to your inner voice can be a lifesaver, both in diving and everyday life. Bart Den Ouden shares his personal journey of uncovering severe heart issues despite passing regular diving medicals, emphasizing the importance of recognizing warning signs and overcoming cognitive biases like denial and confirmation bias. We also discuss a diver’s near-fatal experience with immersion pulmonary edema (IPO) and how quick action and a well-equipped facility saved their life. These stories highlight the critical role of self-awareness, preventative measures, and teamwork in planning to fail safely—whether under water or on land. Listen in to learn why trusting that “little voice” could be the key to staying alive.
Original blog: https://www.thehumandiver.com/blog/plan-to-fail-safely-part-2-passing-the-test-doesn-t-say-it-all
Links: Angioplasty and Stent: https://www.nhs.uk/conditions/coronary-angioplasty/what-happens/
HSE Medical requirements: https://www.hse.gov.uk/diving/medical-requirements.htm
IPO (IPE): http://www.ukdmc.org/medical-conditions/immersion-pulmonary-oedema/
BMJ article: https://heart.bmj.com/content/80/6/537
DAN article: https://www.diversalertnetwork.org/health/heart/cardiac-health
Tags: English, Bart Den Ouden, Cognitive Biases, Decision Making, Medical
Apr 9, 2025 • 12min
SH163: Who owns the risk in diving when something goes wrong?
In this episode, we delve into risk management and decision-making in diving, exploring the difference between personal and professional responsibilities. Using a case of a divemaster tasked with guiding divers on a challenging wreck dive, we examine the complexities of managing hazards, understanding acceptable risks, and the impact of assumptions and biases. The conversation highlights the importance of preparation, critical thinking, and a proactive approach to safety, while acknowledging the challenges of balancing rules with real-world scenarios. Ultimately, we discuss how diving professionals can navigate these grey areas, fostering safer practices while maintaining the adventurous spirit of diving.
Original blog: https://www.thehumandiver.com/blog/who-owns-the-risk-in-diving
Links: HSE Terms: https://www.hse.gov.uk/managing/theory/alarpglance.htm
Normalisation of Deviance video: https://vimeo.com/174875861
Work as Imagined vs Work as Done: https://humanisticsystems.com/2016/12/05/the-varieties-of-human-work/
Tags: English, Decision Making, Gareth Lock, Risk, Risk Management
Apr 5, 2025 • 6min
SH162: Plan to fail safely - teaching students/candidates for the real world
In this episode, we explore the importance of preparing for failure in diving education, inspired by Hal Watts' quote: “The most dangerous thing about diving is divers themselves.” Using a real-life example from a scuba Instructor Examination, we highlight how training focused solely on passing exams can lead to complacency and poor decision-making in real-life scenarios. Diving instructors and trainers must teach students to plan for and respond to unexpected challenges safely. This involves reflecting on training methods, addressing blind spots, and fostering a mindset where failure becomes a learning opportunity, not a life-threatening event. Part 2 will delve deeper into personal strategies for planning to fail safely.
Original blog: https://www.thehumandiver.com/blog/plan-to-fail-safely
Tags: English, Dart Den Ouden, Instruction, Leadership
Apr 2, 2025 • 8min
SH161: ‘One mistake and you are dead’ – isn’t how accidents normally happen
Dive into the intricate world of diving safety and discover the dangers of 'normalization of deviance.' This conversation uncovers how small shortcuts can lead to disastrous outcomes in high-risk scenarios. Learn about human factors and cognitive biases that contribute to accidents, emphasizing the importance of looking beyond just outcomes. With insights drawn from aviation, they discuss the Swiss Cheese Model and systems thinking as essential tools for preventing incidents. Implementing practical strategies like checklists and effective debriefs is key to maintaining safety.
Mar 29, 2025 • 5min
SH160: Outcomes are so sexy and attractive…
This episode dives into the critical role of human factors in safety, using a tragic aviation incident and its parallels in diving to illustrate how distractions, pressures, and systemic issues contribute to accidents. We explore how a Royal Air Force training film, "Distractions," highlighted the cumulative factors behind a hypothetical crash, emphasizing the need for shared responsibility in preventing errors. Similarly, the story of Brian Bugge's 2018 diving accident reveals the dangers of focusing solely on individual mistakes while overlooking the broader contributing factors. Accidents rarely result from a single error but emerge from a combination of conditions. By understanding these dynamics, we can better mitigate risks and improve safety in both aviation and diving.
Original blog: https://www.thehumandiver.com/blog/outcomes-are-so-sexy
Links: “If Only” Documentary: https://www.thehumandiver.com/ifonly
Tags: English, CCR, Checklists, Decision Making, Gareth Lock, If Only, Investigations, Rebreather
Mar 26, 2025 • 3min
SH159: The best is the enemy of the good
In this episode, a newly qualified Human Factors in Diving Instructor shares their journey of grappling with impostor syndrome and the challenges of teaching human factors to divers. Despite over a decade of diving instruction experience, they recount feeling inadequate compared to peers and doubting their knowledge, especially when students might view human factors as "common sense." Reflecting on the Dunning-Kruger effect, they explore how experts often underestimate their abilities because they understand the vastness of their field. Through conversations with peers and self-reflection, they learn to embrace the value they bring to the classroom and the importance of fostering curiosity in their students.
Original blog: https://www.thehumandiver.com/blog/the-best-is-the-enemy-of-the-good
Tags: English, Communications, Jenny Lord, Leadership, Teamwork
Mar 22, 2025 • 9min
SH158: Predictive Profiling & diving: “what deviates, deserves attention!”
This episode dives into the critical importance of recognizing deviations from the norm in diving, a concept rooted in situational awareness. Inspired by the 1972 attack at Lod Airport, Bart den Ouden draws parallels between how assumptions can blind us and the role of training and experience in diving. By understanding what “normal” looks like, divers can detect and respond to unexpected changes. We explore mental models, decision-making under pressure, and the value of learning skills the right way to build a strong foundation. Tune in to learn why paying attention to the small details can make all the difference underwater!
Original blog: https://www.thehumandiver.com/blog/predicitive-profiling
Links: Situational Awareness and Decision Making in Diving: https://gue.com/blog/situational-awareness-and-decision-making-in-diving/?fbclid=IwAR1Pq5eqIxWxcc0s1S2CoYefJgkWeXy_pUi8AsjQ8BoKSx-xKKXrLTPqleQ
Tags: English, Bart Den Ouden, Decision Making
Mar 19, 2025 • 8min
SH157: The Good, the Bad and the Ugly!
In this episode, we explore the pitfalls of blindly trusting technology through two cautionary tales—one about a GPS mishap in snowy Quebec and another about divers relying solely on their computers. Automation offers precision and convenience, but over-reliance can dull our awareness and problem-solving skills. We discuss how this applies to diving, where dive computers are invaluable but prone to errors if misconfigured or when they fail. Listeners will learn why it’s essential to combine technology with old-school skills, planning, and situational awareness to ensure safety. Embrace technology, but always have a backup plan!
Original blog: https://www.thehumandiver.com/blog/the-good-the-bad-the-ugly
Tags: English, Decision Making, Helene Pellerin, Situational Awareness
Mar 15, 2025 • 11min
SH156: CCR pre-dive checks and checklists are not always enough to prevent an equipment-based accident!
In this episode, we explore how safety in diving is not just about avoiding accidents but about building systems that can fail safely. Drawing on a real-life incident shared by Phil Short, we examine how a small technical issue—debris in a rebreather valve—could have escalated into a life-threatening situation during a cave dive. We highlight the critical role of technical preparation, situational awareness, and non-technical skills like teamwork, leadership, and communication in managing and recovering from unexpected challenges. By sharing these stories, we aim to help divers understand how to plan for failures and enhance safety through learning, reflection, and a chronic unease about what could go wrong.
Original blog: https://www.thehumandiver.com/blog/failing-safely-400m-back-in-a-cave
Links: How Safe is Your Diving blog: https://www.thehumandiver.com/blog/how-safe-is-your-diving
Tags: English, CCR, Decision Making, Gareth Lock, Leadership, Non-Technical Skills, Teamwork


