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I've just graduated http://al4a.fun/al4avideos/ al4a.com Part of the danger is how swimmers can disappear under the surface. Even in a clear pool, a swimmers movement can blur their presence. In a murky water pond, its even more dramatic. But the Wahooo system also helps lifeguards locate a downed swimmer, using a tracking device. Before, the best way to find a lost swimmer was to form a rescue line, sweeping the area step-by-step.

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