There are many known lost human kingdoms which sank beneath the waters of the ocean. Around the world and through the centuries, the legends and histories survive.
For example, Platon (428 b.C. -347 b.C.) spoke about Atlantis. Augustus Le Plongeon (1826-1908) spoke about the lost continent of Mu and Lemuria. The natives of Eastern Island spoke about the lost Hiva and the Samoans about Poluto. In North America, the Hopi had a legend about lost kingdoms: “In the bottom of the seas lie all the proud cities”.
Whatever, the evidence is that under the seas and oceans there are a lot of ancient human ruins waiting for be discovered. And sometimes, enthusiastic divers find out spectacular constructions.
One of this up-breathings discoveries is the Yonaguni ruins. In front of the coastal line of Japanese islands, localized on 24.432°N 123.011°E the divers will can find a massive rock formation. It seems like a natural environment modified by human hands. Others says that are a completely men-made artifact. It were discovered in 1987 by Kihachiro Aratake. He showed the singular seabeds formations, similar to architectonic structures.
Moreover, during the winter months is a meeting point for hundreds of hammerheads sharks from surface to 40m deep. And also is a meeting point for divers, archaeologists, naturalists and curious souls.
The hammerhead sharks use their head to pin down the prey. There are several species. of the genus Sphyrna. The bigger is the Great Hammerhead Shark. The size range of the known species from 1 to 6 m and the weight range from 3 to 580 Kg. Their lifespan range is between 25 to 35 years.
As other sharks, they have a special organ named Lorenzini ampullae. It is conformed by many electro-receptors, capable to detect very weak electrical pulses (as the heart beating of a flounder fish buried under the sand!).
They have a peculiarity. Hammerheads sharks do not lay eggs. The females give to birth her offsprings. Around 20 to 50 puppies are born into the water in one time.
Nowadays, many species are seriously threatened.