What change in visibility might divers experience at greater depths during a night dive?

Divers might experience diminished visibility at greater depths during a night dive primarily due to the absorption of light as they descend. In underwater environments, light diminishes significantly with depth, especially in the blue and red spectrums. This reduced light availability leads to several factors that can contribute to poorer visibility, such as the increased presence of particulates and organisms that scatter and absorb light.

While it can be true that deeper waters may have less suspended sediment in some circumstances, the overall effect at greater depths typically results in a decline in visibility due to the lack of effective illumination. As divers go deeper, the amount of light available for their vision decreases, impacting how far and clearly they can see. It is crucial for divers to be aware of these visibility changes when planning their night dives, as this has implications for safety and navigation.

The alternative options suggest scenarios that do not align with the typical experiences of divers in deeper water during a night dive, where the combination of light absorption and potential scattering of existing light leads to reduced visibility.