Beckman, Seth David - Non-inquest findings

34y · Male·Drowning due to shallow water blackout

A 34-year-old man died from drowning in a residential swimming pool while practicing breath-holding with hyperventilation, a technique he had used since childhood for spearfishing competitions. The coroner concluded death resulted from shallow water blackout—hyperventilation reduces blood CO₂, delaying the breathing urge and causing loss of consciousness at shallow depths. Contributing factors included the deceased's known practice of hyperventilating before breath-holding despite warnings from his twin brother (who had previously experienced loss of consciousness from the same practice), recent sleep deprivation following his father's sudden death, a mild blood alcohol level (0.09%), and possible underlying cardiac abnormality (left ventricular hypertrophy of uncertain aetiology, possibly related to reported steroid use). Supervision was present but inadequate—the brother monitoring him misinterpreted signs of distress as normal breath-holding behaviour. This death highlights the serious risks of hyperventilation before breath-holding and the importance of recognising warning signs of shallow water blackout.