I was taking with my dad and we got on the subject of what would happen if you dropped a spring into the ocean. Well, I said nothing it would sink to the bottom and not compress because pressure is pushing on it equally from all directions. He agreed. Then I said what would happen if you slapped a hemisphere on each end of the spring (imagine cutting a ball bearing in half and welding it to the spring... cut sides of the bearing being welded to the spring). Basically my argument is that the spring will compress as the ocean pressure rises because there is more surface area on the outsides of the hemispheres than there is on the insides (more surface area = more pressure pushing in on each side of the spring than pushing out). My dad says no that won't happen it will do nothing as the pressure increases just like the spring with nothing on it. Who is right?