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The grey area indicates the deck of the boat. A dorade box (also called a dorade vent , collector box , cowl vent , or simply a "ventilator") is a type of vent that permits the passage of air in and out of the cabin or engine room of a boat while keeping rain, spray, and sea wash out.
Schematic cross section of a pressurized caisson. In geotechnical engineering, a caisson (/ ˈ k eɪ s ən,-s ɒ n /; borrowed from French caisson 'box', from Italian cassone 'large box', an augmentative of cassa) is a watertight retaining structure [1] used, for example, to work on the foundations of a bridge pier, for the construction of a concrete dam, [2] or for the repair of ships.
[[Category:Patrol boat navigational boxes]] to the <includeonly> section at the bottom of that page. Otherwise, add <noinclude>[[Category:Patrol boat navigational boxes]]</noinclude> to the end of the template code, making sure it starts on the same line as the code's last character.
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The hulls of boats and ships were once waterproofed by applying tar or pitch. Modern items may be waterproofed by applying water-repellent coatings or by sealing seams with gaskets or o-rings . Waterproofing is used in reference to building structures (such as basements , decks, or wet areas), watercraft, canvas, clothing ( raincoats or waders ...
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One copy of life saving signals on waterproof paper. One set of fishing tackle. A food ration with an energy value of at least 10,000 kJ (2,400 Cal) for each person the liferaft is designed to hold, packed in airtight and waterproof packaging. Watertight container with 1.5 litres of fresh water for each person the liferaft is designed to hold.
The metal sheathing of Cutty Sark, made from the copper alloy Muntz metal. Copper sheathing is a method for protecting the hull of a wooden vessel from attack by shipworm, barnacles and other marine growth through the use of copper plates affixed to the surface of the hull, below the waterline.