Another image of one of my favourites, Bobtail Squid at Rye, Victoria, Australia on a night dive. Nikon D700 in Nexus housing.
Photocomp June '11 - Open
This Nocturnal Lights M220 LED Dive Light with its high intensity 3W LED bulb is a practical and convenient dive light. You could use it to look under ledges and to restore natural color underwater. The light is also perfect for night dives or as a back-up for cave and other overhead environments. It is submersible to 328' (100m).
A useful safety device for most divers is the surface marker buoy. In essence it is an easily seen surface float which is connected to the diver by means of a thin, strong line, usually carried on a reel.