Quick Answer
Risks of hypothermia in tropical waters include exposure to cold air at night, immersion in cooler-than-expected water, and exhaustion from swimming or floating. Hypothermia can set in as quickly as 30 minutes in cold water. Awareness of the risks and taking preventive measures is crucial for survival.
Cold Water Shock and Immersion Response
In tropical waters, the risk of hypothermia arises from the unexpected cold shock response when entering the water. Water temperatures of 78°F (25°C) or lower can cause cold shock, leading to rapid breathing, panic, and a strong urge to escape. To mitigate this, take slow, deep breaths while entering the water. This helps to slow down your heart rate and conserve energy.
Prevention and Treatment
Preventing hypothermia involves staying dry, using insulation, and managing your energy expenditure. In a life raft, stay away from the wet floor and use a dry change of clothes if possible. If you become wet, use a space blanket or emergency bivvy sack to retain body heat. To treat hypothermia, remove wet clothing, provide shelter, and apply warm compresses to the head, neck, and torso. Use hand and foot warmers if available.
Signaling for Rescue and Staying Alive
While treating hypothermia, prioritize signaling for rescue to receive medical attention and warm clothing. In a life raft, use a mirror or shiny surface to reflect sunlight towards any passing aircraft during the day. At night, use flares or a smoke signal to signal your location. Ration water and food carefully, aiming for 1 liter of water per person per day. Fishing can be a vital means of supplementing your food supply, but only attempt it when you’re confident in your ability to catch and prepare food safely.
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