The Tower Was Already Full of Holes

The Tower Was Already Full of Holes

The Tower Was Already Full of HolesGareth Lock
Published on: 03/03/2026

When diving incidents occur, we blame the last person to touch the tower. But the holes were already there. Real learning comes from asking "how did it make sense?" not "who's to blame?" Systems thinking changes everything. Be better than yesterday.

THD-EnglishTHD-Safety & Risk Management
'They Lost Situation Awareness'

'They Lost Situation Awareness'

Published on: 22/04/2025

When an adverse event occurs, we often hear the cause described as a 'loss of situation awareness.' This phrase by itself fails to yield the actual contributory factors that led to the event, limiting our ability to learn from the incident.

CCR Diver Goes Hypoxic on Surface – What Causal Reasoning Taught Me About Learning from Events

CCR Diver Goes Hypoxic on Surface – What Causal Reasoning Taught Me About Learning from Events

Published on: 13/04/2025

An experienced CCR diver nearly passed out due to low loop pO2 after missing a key pre-dive check. This blog uses Causal Reasoning to understand the situation, exploring human factors, system design, and performance-shaping conditions, rather than focusing on counterfactuals and the individual.

Diving Deep into Diving Safety: The death of Linnea Mills through a lens of HF and System Safety

Diving Deep into Diving Safety: The death of Linnea Mills through a lens of HF and System Safety

Diving Deep into Diving Safety: The death of Linnea Mills through a lens of HF and System SafetyGareth Lock
Published on: 09/03/2025

Dive deeper into system safety and see how small mistakes can lead to big accidents. Drawing on real-life incidents—including the tragic Linnea Mills case—discover how we can strengthen teamwork, adopt just culture, and embrace best practices for safer, more resilient dives.

THD-Sense-making, Decision-making, & Psychology
Change your Language. Change the World

Change your Language. Change the World

Published on: 07/01/2025

The way we describe events shapes how we learn from them. "The diver ran out of gas" invites blame, while "the gas ran out" sparks deeper questions. In high-risk environments, precise, non-judgmental language fosters learning and safety. Shift your focus from fault to context—and improve outcomes!

Single Diver Fatality in Cenote Nariz, 3 February 2024. CREER Report

Single Diver Fatality in Cenote Nariz, 3 February 2024. CREER Report

Published on: 23/09/2024

A comprehensive report from the CREER safety and line committee into a fatality in February 2024. It is of note because it includes commentary about HF and the wider contextual factors.

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Be better than yesterday.

Human factors, non-technical skills and learning from emergent outcomes for the divers who refuse the bad-apple story.

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