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The video "Por qué tem essa água saindo do navio?" explains the reason behind ships carrying water in their tanks before departure. This water, known as ballast water, is crucial for maintaining the stability of the ship and preventing excessive rolling or tipping. It is used in platforms like oil rigs and submarines as well. The video also explores the role of water as ballast in a ship and the use of buoyancy tanks in boats and ships. By controlling the buoyancy of these tanks, the boat can be made to float at a desired depth, and in emergency situations, snorkels and compressed air can be used to help the boat float back up to the surface.