Which one of the following enhances dive safety during limited visibility?

Using an acoustic signaling device significantly enhances dive safety during limited visibility conditions. Such devices, which may include whistles, underwater buzzers, or other audible signaling tools, allow divers to communicate their location and intentions to their dive buddy or the dive group, even when visual contact is compromised. In murky waters or at night, relying solely on visual signals can lead to misunderstandings or separation. Due to the lack of visibility, a sound signal can be more effectively heard over distances, thereby improving coordination and safety among divers.

Choosing to stay close to the surface, wearing bright colors, or utilizing larger tanks does not ensure effective communication or coordination in limited visibility situations. While certain colors may enhance visibility to some extent, they do not replace the need for reliable communication methods.