How does water temperature affect night diving?

Water temperature is a crucial factor to consider when preparing for night diving. As the sun sets, the amount of light penetration into the water decreases, which can lead to a drop in water temperature, especially in shallow areas. This cooling effect can be more pronounced at night due to the absence of solar heating, and as divers descend, they also encounter varying thermal layers.

Diving without appropriate thermal protection, such as a wetsuit or dry suit, can expose divers to hypothermia or discomfort during their dive. Consequently, it is essential for divers to be equipped with the necessary thermal protection based on the anticipated water temperature conditions, especially during night dives when thermal changes can be more drastic.

In contrast, the other options suggest unchanging or irrelevant impacts of water temperature during night diving, which does not reflect the reality of diving conditions. Therefore, understanding and preparing for the changes in water temperature is vital for a safe and enjoyable dive experience.