When using buoyant equipment, what is the term for movement toward the surface of the water?

In the context of buoyant equipment, the term that specifically describes the movement toward the surface of the water is "Vertical ascent." This term clearly conveys the action of rising upwards in a vertical direction, which is a natural consequence of buoyancy acting on an object that is less dense than the water surrounding it.

Buoyancy itself is the force that enables this upward movement, allowing an object or person to ascend from deeper water to the surface. The other terms presented might describe related concepts in aquatic contexts but do not accurately define this directed movement toward the water's surface. For example, "floating" refers to the state of an object remaining on the surface without sinking, while "surface propulsion" indicates a method of moving across the surface rather than rising upwards. "Buoyancy assisted" could imply that buoyancy plays a role in movement but does not specifically indicate a movement towards the surface like "Vertical ascent" does. Thus, the correct answer is able to precisely define the action in question.