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The hull part hole, often referred to as a hull breach or hull penetration, is a crucial aspect of ship and boat design and maintenance. This opening, typically located below the waterline, can serve various purposes, such as accommodating propeller shafts, sea chests, or other underwater equipment. Ensuring the integrity and watertightness of the hull part hole is essential to prevent water from entering the vessel. Hull breaches must be properly sealed, reinforced, and inspected regularly to maintain the structural strength and safety of the vessel, especially in challenging marine environments where the hull is exposed to the pressures of the sea. Proper design and maintenance of hull part holes are fundamental to the safety and seaworthiness of any ship or boat.