Night diving

It frequently refers specifically to recreational diving which takes place in darkness.

The diver can experience a different underwater environment at night, because many marine animals are nocturnal.

[2] Several diver certification agencies offer specialty training in night diving,[3][4][5][6] and it was originally part of the training requirement for the second level of recreational diving (CMAS two-star scuba diver, etc.

[1] Some precautions and skills for night diving include: avoiding shining the light in other divers' eyes, to be aware of and use surface light signals for bearings, and if appropriate to use an illuminated shotline buoy.

Similarly, divers will be dazzled by lights shone in their eyes, and will take some time to recover night vision, during which they will be less able to deal with contingencies.