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The boat is exhibiting positive buoyancy whereas the stone is negatively buoyant. As scuba divers we do not wish to float like a boat or sink like a stone. We need to be neutral in the water so that with a lazy kick of our fins we can move up or down. If we floated we would have to paddle hard to duck beneath the surface and if we sank, we would always be struggling to compensate for the tendency to sink.
For such extended range diving it is often advisable to reduce the emergency jettison weights, to ensure that an emergency ascent is not too swift. Many divers have a combination of pouches and weight belts so that only part has to be removed to achieve slight positive buoyancy. A technical diver may even use integral weights in his twin set that cannot be removed. They know that a rapid ascent would be just as final as drowning. Some will wear a couple of removable kilo weights in small pouches – some do not.