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Rip currents are narrow and fast-moving seaward flow generated by the combined affect of breaking waves and inhomogeneous morphology in surf zone. They are deceptively powerful and may quickly sweep incautious swimmers of all ability levels into deeper water. About 90% of seaside drowning in the world is caused by the neglect of rip currents.
By using hydropower to drive the turbine to generate electricity, the devices emit breams of red lights that create a red rip current area on the sea surface to warn the swimmers to stay away from it.