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This approach of providing either total or negligible protection is referred to as "all or nothing". Most of the other compartments are almost completely unarmored. Therefore, battleship designers tried to save some of that weight by placing heavy armor only around the vital parts of the ship: the ammunition and propellant magazines, the propulsion plant, the fire-control, command and communications sections. The armor tends to be very heavy: on a typical battleship it takes up around 40% of the total displacement of the vessel. In this regard the developers attempted to adhere to historical realism and simulate all significant layers of armor. A projectile that enters the ship can encounter up to four or five layers of armor and may be stopped or ricochet at each layer. Armor in World of Warships is not just a uniform barrier to be pierced (like in World of Tanks), but rather a kind of multi-layered “cake” that covers a number of construction elements and mechanisms, each having specific armoring.
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