What does the term "suction" refer to in wreck diving hazards?

The term "suction" in wreck diving hazards specifically refers to the risk of entrapment in wreckage. When divers explore sunken vessels or debris, they may encounter voids or compartments that can trap a diver. This entrapment occurs due to the design of the wreck, the configuration of the debris, or the movement of water that can create a "suction" effect, making it difficult for a diver to escape.

Understanding this hazard is crucial for divers, as being aware of potential entrapment can enhance safety protocols and encourage divers to plan their dives carefully. By assessing the wreck structure and recognizing areas where suction may occur, divers can take precautions to mitigate this risk, such as using appropriate dive teams and techniques or avoiding certain areas altogether.

In contrast, the other choices represent different concepts that are not associated with the specific danger of suction in wreck diving. For instance, currents that pull divers away may affect their buoyancy recovery but are not directly related to the entrapment scenario. Similarly, loss of buoyancy and strong underwater visibility are concerns divers need to address but do not specifically tie into the concept of suction within wreck environments.