All About Diving
Night diving is a type of recreational diving which takes place in darkness. The diver may see more and has a different underwater experience at night because many marine animals are nocturnal and the diver is forced to concentrate on smaller, nearby objects.
There are additional hazards when diving in darkness, such as torch or flashlight failure resulting in losing vertical visual references and being unable to control depth or buoyancy, being unable to read instruments such as dive computers and diving cylinder contents gauges and separation from the rest of the diving group, boat or shore cover.
Normal precautions for night diving are to have a torch/flashlight, to use a strobe light, to avoid shining your light in other divers' eyes, to know and use surface light signals and to use a surface marker buoy with an attached strobe or cyalume stick.