Mystery behind underwater 'crop circles'

Divers were stumped by these strange patterns first discovered off the coast of Japan in 1995... until they caught the culprit red-handed years later.

A photographer captured the photos while on a dive near Amami Oshima at the southern tip of Japan. The rippling geometric sand patterns, almost 80ft below sea level, were estimated to be nearly 6ft in diameter.

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Crop circles
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Crop circles
KELSO, SCOTLAND - MAY 03: The Messenger is a series of four new works in the landscape made by artist Hilary Jack in response to the rich history of Mellerstain House in the Scottish Borders near Kelso. Hilary Jack standing in the 'In Memoriam', a 25-metre wide drawing on the lawn in white turf paint, reflecting the decorative plasterwork throughout Georgian manor designed by Robert Adam (1728-1792). It also serves as a memorial to the 13th Earl, John Baillie Hamilton (1941-2016), a British peer and politician famed for his extensive knowledge of crop circles and interest in the paranormal, who resided at Mellerstain throughout his life on May 3, 2018 in Kelso, Scotland. (Photo by Robert Perry/Getty Images)
WILTSHIRE, ENGLAND - AUGUST 19: Crop circles adorn wheat fields near to Walkers Hill White Horse and North of Alton Barnes, August 19, 2009 the Vale of Pewsey, Wiltshire, England. (Photo by David Goddard/Getty Images)
ALAMOSA, CO - JUNE 13: Crop circles are seen from the air near Alamosa, Colorado on June 13, 2018. Flight for aerial photos was provided by Eco Flight. (Photo by RJ Sangosti/The Denver Post via Getty Images)
DENVER, CO - September 7, 2016: Green crop circles resulting from center-pivot irrigation systems in Colorado as seen from a passenger plane departing Denver International Airport and heading east. (Photo by Robert Alexander/Getty Images)
People walk through crop circles shaped into a cornfield near Raisting, southern Germany, on July 28, 2014. According to media reports, a balloonist had discovered the circle some days ago. Since then, hundreds of people came to the field to watch it, however it is unclear who did create the pattern. AFP PHOTO / DPA / KARL-JOSEF HILDENBRAND / GERMANY OUT (Photo credit should read KARL-JOSEF HILDENBRAND/AFP/Getty Images)
WILTSHIRE, ENGLAND - AUGUST 19: Crop circles adorn wheat fields near to Walkers Hill White Horse and North of Alton Barnes, August 19, 2009 the Vale of Pewsey, Wiltshire, England. (Photo by David Goddard/Getty Images)
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A TV crew carried out a study of the mysterious underwater circles and found that the 'artist' was a small puffer fish which, using only its flapping fin, tirelessly worked day and night to carve the circular ridges.

It is designed to attract female puffer fish. After mating, they lay eggs in the centre of the undersea circles.

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