These underwater crop circles are highly complex and can measure an astonishing six feet in diameter.

These underwater crop circles are highly complex and can measure an astonishing six feet in diameter.

This behavior was first reported last year, but the paper was only published earlier this month.

You can check out the paper here :
http://www.nature.com/srep/2013/130701/srep02106/full/srep02106.html

Photo credit:  Yoji Ookata