This school of blackfin barracuda (Sphyrena qenie), photographed off the island of Sipadan in Malaysian Borneo, swarmed up from the ocean floor to protect their surroundings by forming a defensive circle around one of Doubilet’s fellow divers. “I am constantly surprised by the geometric patterns formed under the waves,” says Doubilet. But these patterns can be fleeting. “This living sculpture lasted for about three seconds - just five frames - before the fish dispersed and disappeared.”
Source: Knowledge magazine ASIA edition Vol. 4 Issue 1 Page 58. Photograph by David Doubilet (website here)
You have to buy the magazine to look at this picture, it’s just magnificent.