Blue-ring octopus, Hapalochlaena lunulata     (Family Octopodidae)    

Location: Yembeser Jetty, Dampier Strait, Indonesia

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

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