Favourites & Recommendations

The Human Diver — Gareth Lock

If I had to point at one thing that changed how I teach, it's this. Gareth Lock took human factors — the science of why well-trained, capable people still make mistakes — and built it into something the diving world had never really had before. Not another skills drill. Not another acronym. A genuine framework for understanding why things go wrong, and what a team can actually do about it before they do.

Here's the bit I keep coming back to, and the bit I talk about constantly in the classroom: ego. Technical diving attracts capable, driven people — and capable, driven people are exactly the ones most likely to talk themselves past a warning sign. The gear doesn't kill divers. The training doesn't fail. It's almost always something quieter than that — pride, pressure, not wanting to be the one who calls the dive. I've watched it nearly happen. I've felt the pull of it myself.

That's the whole philosophy in five words, and it's one I say to every team I brief. Safety isn't the instructor's ego, or the most experienced diver's call — it's the team's eyes, all of them, all the time. A thumb from the newest diver in the group should carry exactly as much weight as one from the most qualified. The moment that stops being true, you've got a human factors problem, not a skills problem — and Gareth's work is where I learned to actually see that, name it, and teach it.

This isn't just theory for me. It's shaped my briefings, my debriefs, how I build teams underwater, and honestly how I think about my own diving. If you lead a team, teach, or just want to understand why good divers still get it wrong sometimes, start here. It's the best money and time I've spent on my own development since I qualified.

There's a proper pathway here too — from free reading and listening right through to in-person Applied Skills training and beyond. Wherever you are with it, there's a sensible next step.