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The Thames' Deadliest Secret | Cold Water Shock
February 17, 2021 · 7 min · 5K views
What this video covers
The Thames presents significant hazards to swimmers and boaters, primarily due to cold water shock, fast-moving tides, and dangerous undercurrents.1:37 Cold water shock triggers an involuntary, immediate gasp reflex and hyperventilation, which can lead to drowning after inhaling as little as two to three pints of water.5:26 Even strong swimmers lose the ability to control their breathing or perform basic survival tasks within seconds of immersion.5:46 Beyond the immediate physiological response, the river’s strong currents and eddies frequently trap individuals under pontoons or sweep them away from the shore.0:54 Historical incidents, such as the 1989 Marchioness disaster involving the aggregate carrier Bowbell, highlight the risks of navigation and visibility on the river.0:12 Emergency services, including the RNLI and Port of London Authority, emphasize that if a person falls into the water, the most effective survival strategy is to float, remain calm for 60 to 90 seconds, and keep the airway clear until the initial panic subsides.6:33
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