Question

Imagine a body that is completely submerged in water, but whose depth of submergence can be varied. In which case does it experience a larger upthrust, when it is submergged deep or shallow?

Answer 1

According to Archimedes' principle the upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially, is equal to the weight of the fluid that the body displaces.

So clearly when it is submerged deep it will displace larger volume of water as compared to when submerged shallow so in case of deeply submerged it will experience greater buoyant force.