Archimedes’ principle

the buoyant force experienced by an object submerged in liquid is equal to the weight of the fluid that object displaces, which is equal to the volume displaced multiplied by the weight density of the fluid (Fbuoyant = γV ). Relevant to displacer-type instruments, which work by sensing the buoyant force exerted on an object as liquid rises around it.

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But, if the submarines hav wide platform to water, and its make of good quality high carbon iron, how this principle going to authorative