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Severe exertional heat illness (EHI) poses a significant risk to those undertaking prolonged physical activity, including military training,1 and best-practice guidance2 3 recommends treating promptly with whole-body cold water immersion (CWI). Improving the early availability of CWI is imperative for those at risk of severe EHI and requires healthcare teams to become competent and confident in its delivery. However, outside certain specialised settings,4 severe EHI may be seen only occasionally by individual military medical practitioners. As such, opportunities to learn the safe delivery of CWI may be limited, and no recognised programme exists to train personnel.