Like UFO,Unidentified Underwater Marine Objects( UMO) are known to exist.USSR in its classified files speaks of this.
We know of the Crop Circles on land.
Now comes the news that Crop Circles have been noticed in the sea South of Japan at 80 feet down and this has been video-graphed.
Story;
“This is an underwater structure built about 80 feet underwater off the coast of the southern Japanese island of Anami Oshima.Considering no one had ever encountered anything like it, diver and underwater photographer Yoji Ookata was at a loss to explain what had built the circular, repeating, and clearly geometric structure. The architects of this feat of underwater engineering were discovered by Japanese broadcaster NHK, and the answer to what built the six and a half foot wide structure is at once mundane and really impressive.
The builder, it turns out, was a single ordinary — but exceptionally hard-working – pufferfish.
A film crew from NHK staked out this bizarre creation only to find that the entire structure was carved out by a single male pufferfish, tirelessly swinging his fin in the sand to create the grooves and ridges of the structure, which is many times the size of his own body. They also found that beyond just carving out the repeating shapes, he was also decorating the structure as he built it, peppering it with small stones and seashells.
Why would a pufferfish go through with all this trouble, you ask? Well, for the same, arguably one and only reason males of any species do anything ever — to attract a mate.
The structure, as striking and alien as it may look, especially beneath the surface of the waves, is actually a stunningly pragmatic one, acting as both love nest and nursery for the pufferfish. Females are drawn to the structures, where they mate with the males and leave their fertilized eggs behind. That’s when it becomes clear that those ridges aren’t just for beautifying the neighborhood. They serve as buffers to the ocean currents, making sure the newly fertilized eggs stay in one place. Researchers hypothesize that the shells the puffer brings to the structure may also be more than decorative, and could provide nutrition for the developing eggs._
_geekosystem.com
Related:
YouTube write-up;
Yoji Ookata who obtained his scuba license at the age of 21 and has since spent the last 50 years exploring and documenting his discoveries off the coast of Japan. Recently while on a dive near Amami Oshima at the southern tip of the country, Ookata spotted something he had never encountered before: rippling geometric sand patterns nearly six feet in diameter almost 80 feet below sea level. He soon returned with colleagues and a television crew from the nature program NHK to document the origins what he dubbed the “mystery circle.”
Underwater cameras showed that the artist was a small puffer fish who, using only his flapping fin, tirelessly worked day and night to carve the circular ridges. The unlikely artist — best known in Japan as a delicacy, albeit a potentially poisonous one — even takes small shells, cracks them, and lines the inner grooves of his sculpture as if decorating his piece. Further observation revealed that this “mysterious circle” was not just there to make the ocean floor look pretty. Attracted by the grooves and ridges, female puffer fish would find their way along the dark seabed to the male puffer fish where they would mate and lay eggs in the center of the circle. In fact, the scientists observed that the more ridges the circle contained, the more likely it was that the female would mate with the male. The little sea shells weren’t just in vain either. The observers believe that they serve as vital nutrients to the eggs as they hatch, and to the newborns.
What was fascinating was that the fish’s sculpture played another role. Through experiments back at their lab, the scientists showed that the grooves and ridges of the sculpture helped neutralize currents, protecting the eggs from being tossed around and potentially exposing them to predators.”
Ramanisblog 
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