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This is wrong.

 Buoyancy is the weight of an object minus the weight of the volume of water
it displaces. This is why a canister with batteries is negatively buoyant,
and a canister with air or anything that weighs less than the amount of
displaced water is positively buoyant. If he adds lead to the inside of the
canister, it will make it more negatively buoyant.

Drew Glasbrenner

> The canister has a fixed amount of buoyancy as a result of its
> displacement. FIlling it with feathers, epoxy or lead will not effect
that.
> You can make it heavier or lighter, but that displacement and resulting
> buoyancy will always be the same.

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