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The automatic inflatible jackets have a plastic canister with holes that allows water to enter which disolves a tablet which then releases the trigger mechanism that perferates the CO2 cartridge.
Think of ideas to delay the passage of water through these holes, like
Reduce the opening of the holes by blocking with tape.
Place a small sponge in plastic canister that will delay the trigger.
If the vest inflated without you taking water in then it could have been the humidy.
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