Bubble coral, Plerogyra sinuosa     (Family Euphyllidae)

Location: Steve's Bommie, Ribbon Reef #3, Great Barrier Reef, Australia

Depth: 14.3 m

Equipment: Nikon D70 with Micro-Nikkor 60mm f/2.8D in Ikelite housing and Ikelite DS50 & Ikelite DS125

Settings: ISO200, 1/125s, f/16