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A ship never completley floats on water, a part of it is always submerged below the water surface depending upon its weight. The Plimsoll line is a line drawn on the lower end of ships, marking the maximum level to which the ship can sink into water after its tare capacity is full. If the water level goes above the Plimsoll line in the event of overloading or other technical problems, it is considered dangerous as the ship may sink.

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