On the coast Japan took out the huge metal sphere. What is it?

The mysterious sphere from metals with a diameter about 1,5 meters became a source of speculation in Internet. Police and inhabitants of the Japanese coastal city were confused by the big iron sphere which has been thrown out on a local beach, thus the authorities recognize that concepts have no that this such. According to messages of local mass media, the sphere with a diameter about 1,5 meters appeared in the center of speculation since it was thrown out on Ensukham's beach in the city by Hamamatsu on the Pacific coast of the country. Fears that it there could be a mine, vanished after experts used x-ray technologies for research...