The radioactive substance hundreds of times the density of the standard value in the sea.

To understand the influence of the accident of the Fukushima Daiichi nuclear power plant, the Ministry of Education, Culture, Sports, Science and Technology investigated the soil in bottom of the sea within the wide range from Miyagi Prefecture to Chiba Prefecture.

As a result, this ministry announced that there was a point where the radioactive substance hundreds of times the density of the standard value had been detected.