14 DAY TRIAL // Diver and underwater photographer Yoji Ookata discovered the mysterious circles in the semi-tropical region of Amami Oshima, off the coast of Japan.
Ookata immediately deemed the underwater sculpture a deep sea “mystery circle.”
This complex structure lies 80 ft (25 m) below sea level. It spreads along 6.5 ft (2 m), and its multiple ridges create perfectly symmetrical circles.
A male puffer fish built the sculpture during what seems to be a courtship attempt. The small fish used a single fin to create this amazingly complex sculpture. Female fish are attracted by the grooves and the ridges, and drown to the center of the circle where they mate and lay eggs.
As a bonus, Spoon-Tamago reports, the ridges of the circle act as the walls of a fortress, neutralizing currents and protecting eggs.
