Do these V's float when water filled ?

[captpete13]

if those dock lines broke that boat would have sank to the bottom. It was in a very deep slip. The diver that went into the water to rig the lift bags was 6'4" and was standing upright on the bottom and there was still a few feet of water above him. I think they add flotation,just enough to keep the coast guard happy. But nowhere near enough to keep the boat floating.