15 questions · Nature
The sea forgives different mistakes than the forest and punishes faster. Whoever plunges into cold water almost never dies of hypothermia in the first minutes, but of cold shock: the body gasps involuntarily, hyperventilates, and whoever inhales water in that moment drowns within instants. Against it stands the Canadian 1-10-1 rule: one minute to get your breathing under control, then about ten minutes of useful muscle power for the most essential task, and roughly one hour until unconsciousness: time in which rescuers can arrive, if you don't swim it away. For here too the rule holds: stay with the capsized boat. It floats, it half-shelters you, and it gets seen; whoever must save energy pulls the knees to the chest in the HELP position. From the surf's trap, the rip current, you don't escape against the stream but parallel to the beach. The sea's most famous error, though, concerns drinking: seawater is saltier than the kidneys can process: whoever drinks it loses net water and speeds up dying of thirst. At sea you collect rain; on tropical shores, coconuts carry sterile water. The stranded pitch camp above the tide line that the wrack line of driftwood honestly marks, cover up against a sun that reflects doubly off the water, and treat jellyfish stings not with fresh water (which fires the remaining stinging cells) but with seawater and, for many species, vinegar. Mussels join the emergency menu only cooked, and only those that stayed closed beforehand. And whoever finds a radio: the maritime distress call belongs on VHF channel 16, spoken three times: Mayday.
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It costs the body net water
Seawater is saltier than urine can be: to excrete the salt, the kidneys use more water than the sip delivered. Every swallow speeds up dying of thirst.
Cold shock
The cold-water reflex forces a gasping fit: under water or in a wave, that is the fast way to drown. Hypothermia itself takes far longer than everyone thinks.
1 minute to control breathing, 10 minutes of useful movement, 1 hour to unconsciousness
Cold researcher Gordon Giesbrecht's mnemonic: first breathe through the shock, then spend the remaining muscle power on the most important thing: knowing an hour of rescue time remains.
Stay with the boat
A hull floats, keeps you half out of the water and is a hundred times easier to spot from the air than a head in the waves. Distances to shore are drastically underestimated from the water.
Pull your knees to your chest: the HELP position
Heat Escape Lessening Posture: curl up, arms to the torso, stay as still as the life jacket allows. Swimming pumps warm water out of your clothes and chills you faster.
Swim parallel to the beach
The rip is a narrow band: fighting it exhausts even lifeguards, but a few dozen metres sideways takes you out of it. Then ride the waves back in.
Only once outside
An inflated vest pins you to the ceiling of a flooding cabin and makes diving to the exit impossible. Put it on inside, inflate outside.
Collected rainwater
Tarps, sails and every life-raft kit are made for catching rain: let the first minutes run off until the salt is washed away. Modern rafts also carry reverse-osmosis hand pumps.
The coconut
Green, unripe nuts hold up to half a litre of sterile coconut water. In quantity it acts as a laxative: alternate with rainwater when you can.
By the wrack line of driftwood
The line of seaweed, wood and debris marks the last high water. Camp, fire and gear belong well above it: the tide arrives more reliably than any alarm clock.
Fresh water makes the stinging cells fire
The osmotic shock triggers the remaining nematocysts. Right: rinse with seawater, lift off tentacle remains (don't rub), vinegar helps for many species and heat against the pain.
Eat them only cooked and only ones that were closed
Open mussels that don't shut when touched are dead and spoiled. Cooking kills vibrio and viruses; after algal blooms even that is no guarantee: when in doubt, go without.
The sun
Water nearly doubles the UV load by reflection: sunburn, salt sores and heat exhaustion weaken you faster than hunger. Cover up, make shade, be active at the day's edges.
On channel 16
Channel 16 (156.8 MHz) is the international calling and distress channel that coastguards and ships monitor constantly. The spoken distress signal is "Mayday", three times.
💡 Did you know? "Mayday" comes from the French "m'aider", short for "venez m'aider": come and help me.
The flood tide cuts off your way back
In shallow bays the water comes in faster than a person can wade: ignore the tide and you stand on a shrinking sandbank. Check tide times before you set out.
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