Question

At what depth is the buoyant force on a submerged object the greatest?

Answer 1

at the Seabed-because p0 (atmosphere pressure) and pressure of water (up water on the submerged thing) is the most.
its useful to know:p=f/a-and:f=mg--and:we can measure m with rho of water (rho=density)---and after calculation this adds up ATM pressure (about 101kpascal)
that's it

Answer 2

Perhaps a trick question. Yes, the buoyant force is equal to
(density of water)(volume of object) (acceleration of gravity), but the compressibility of water is very small. Go with seabed, though.