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I'm interested on how a 45-gallon drum (filled with air) behaves when submerged in water. I did some calculations and from what I calculated a 45-gallon drum displaces 170kg of water, therefore the upward (buoyant) force on the drum when submerged would be 170kg minus the weight of the drum..Does this buoyant force increase with depth? I know the pressure exerted by the depth of the water will increase greatly with depth, so is there a point where the pressure of water pushing down on the drum balances out the buoyant force?

i'd appreciate some help, my physics is rusty to say the least!