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Shelter above the sea. The cause for most accidents during various activities in the sea is deterioration of physical strength by staying in water too long. Therefore, to prevent accidents due to deterioration of physical strength from happening, I suggest a rest area in the sea. People can rest any time during their activities or when they get lost in the sea. They can inform rescue workers by pushing a button inside which would turn on emergency SOS light.
chungbuk, South Korea