How does visibility typically change at night?

How does visibility typically change at night?

• A. It remains the same as during the day
• B. It often decreases due to darkness
• C. It increases due to artificial lights
• D. It fluctuates significantly throughout the dive

Answer: (B)

Visibility typically decreases at night due to the absence of natural light. During the day, sunlight penetrates the water, allowing for improved visibility. However, as night falls, the lack of available light can make it significantly harder to see underwater. This natural decrease in ambient light alters perception and can lead to reduced visibility, especially in deeper waters or if there are particles or debris present. While artificial lights can enhance visibility to some extent by illuminating the immediate area around divers, the overall visibility in the absence of such lights is generally less than during daylight conditions. Therefore, the condition of visibility being less at night is a consistent aspect divers must account for when planning their dives. Understanding these changes in visibility is crucial for safety and navigation during nighttime dives.

Visibility typically decreases at night due to the absence of natural light. During the day, sunlight penetrates the water, allowing for improved visibility. However, as night falls, the lack of available light can make it significantly harder to see underwater. This natural decrease in ambient light alters perception and can lead to reduced visibility, especially in deeper waters or if there are particles or debris present.

While artificial lights can enhance visibility to some extent by illuminating the immediate area around divers, the overall visibility in the absence of such lights is generally less than during daylight conditions. Therefore, the condition of visibility being less at night is a consistent aspect divers must account for when planning their dives. Understanding these changes in visibility is crucial for safety and navigation during nighttime dives.