Which of the following is a common visibility challenge when diving at night?

Reduced light penetration at depth is a significant visibility challenge encountered during night diving. In the absence of natural sunlight, the ability of light to penetrate through water diminishes, particularly as depth increases. This leads to limited visibility, where divers can find it challenging to see their surroundings clearly. The darkness can obscure landmarks and marine life, making navigation and observation more difficult.

While color intensity of marine organisms, overhead light sources, and light pollution from the surface may impact visibility in different scenarios, the primary issue is the overall reduction of light as divers descend deeper into the water. Night divers must rely on artificial light sources, like dive lights, to illuminate their surroundings and enhance visibility.