What is the primary concern for divers during night dives?

The primary concern for divers during night dives is visibility. During nighttime, the underwater environment can be significantly darker than during the day, making it more challenging to see. Proper visibility is crucial for various reasons: it affects a diver's ability to navigate, observe the surrounding marine life, and maintain awareness of other divers and hazards in the water. The darkness can also cause disorientation, making it vital for divers to have appropriate lighting and to be well-acquainted with their dive site beforehand. While temperature changes, marine life, and equipment malfunction are relevant considerations, they do not pose the same immediate challenge to a diver's safety and effectiveness as limited visibility does during night dives.