16 Unsolved Mysteries Of The Ocean… These Will Shock You!

2. Underwater Crop Circle

This ocean enigma was found in the island of Anami Oshima in Japan. Although these have been thought to be the work of puffer fish for their quests to find their mates, it was still a mystery on how these came to be. This crop circle has a circumference of over 6 feet, and it is also decorated with shells and other items found at the bottom. But there are still some who believe that this is the work of aliens.