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The emergence of the beach trench always troubles us. The wave stirs up the sediment and deposites at the beach, which leads to the forming of a 30-50 meters offshore trench after a period of time. People usually are not familiar with the situation of the seabed. If the high tide comes, People not taking the secure tips seriously might result in drowning. The Safe Zone floats in the sea. When people are swimming in the sea, it not only can be used as a transit point for temporary rest and in the case of an emergency it could send out signal to notify the rescue personnel at first time.
Qize Song Hao Qin Jinchi Che Zhiliang Zhen