What safety precaution is advised for divers when exploring underwater caves at night?

When exploring underwater caves at night, having a buddy close by is crucial for safety. This is because diving in such environments can present unexpected challenges, including reduced visibility and complicated navigation. A buddy system enhances safety as it allows divers to assist each other in case of an emergency. It ensures that if one diver encounters difficulty, the other is available to provide immediate help, share equipment, or navigate back to safety.

The buddy system is especially important in the darkness of underwater caves where disorientation can easily occur. Partners can signal to each other with their lights, keeping communication open and ensuring that both divers are aware of each other's whereabouts and status, thereby significantly reducing the risks associated with night diving in potentially challenging conditions like caves.