What does "negative buoyancy" signify in diving terms?

"Negative buoyancy" signifies that the diver sinks because their density is greater than that of water. In diving, buoyancy refers to the upward force that water exerts on submerged objects. When a diver's overall density—including personal weight, equipment, and any trapped air—is greater than the surrounding water, they will experience negative buoyancy and descend.

This concept is crucial for divers, especially when considering how to control their position underwater. By adjusting their buoyancy through techniques such as using weights or buoyancy control devices (BCD), divers can manage their ascent and descent. Understanding this helps ensure safety and efficiency while diving. The other options do not accurately describe negative buoyancy; instead, they pertain to situations where the diver either remains at the surface or floats, which relates to positive buoyancy rather than negative buoyancy.