Which factor is NOT typically a consideration when planning night diving?

• A. Additional lighting
• B. Visibility considerations
• C. Communication reliability
• D. Decreased risk of entanglement

Answer: (D)

Night diving planning centers on how darkness affects sight, navigation, and communication. With limited ambient light, you must rely on extra lighting—primary and backup lights, spare batteries, and a plan for losing light or dealing with beam limitations—to clearly illuminate hazards, entry/exit paths, and your buddy’s position. Visibility conditions are assessed to understand how far you can see, what backscatter might do to your view, and how drift or currents affect staying with your buddy and following a planned route.

Reliable underwater communication becomes more critical in the dark, since visual cues are harder to pick up. You plan clear signaling methods, ensure visibility of signals with lights, and often use lines or reels to maintain contact and orientation if visibility or contact with your buddy is compromised.

Entanglement risk, however, does not decrease in the dark. In fact, reduced visibility can make lines, kelp, nets, and gear hazards easier to collide with or overlook, so you plan to mitigate entanglement with careful gear stowage, familiarity with the site’s potential entanglement hazards, keeping lines managed, and having cutting tools and a buddy system ready. Because the notion of a decreased entanglement risk isn’t something you plan on, it isn’t a typical consideration when planning a night dive.