Blue-lined octopus, Hapalochlaena fasciata     (Family Octopodidae)    

Location: Camp Cove, Watsons Bay, New South Wales, Australia

Equipment: Nikon D7000 with Micro-Nikkor 60mm f/2.8D in Ikelite housing and 2 x Ikelite DS161

Settings: ISO200, 1/200s, f/16