In the press conference of 1/24/2012, Tepco announced they are going to solidify the bottom of sea with the mixture of clay and concrete.
They are planning to start it from early February, end it by April.
It is not to spread concrete to cover the sea ground but cover it with heavy clay slowly so hot particles in the sea will not come up.
The areas around intake of reactor 1 ~ 6 will be covered.
They still have not assessed the influence for the marine environment.
After the press conference, MEXT released the data of contamination level on of sea ground.
Ag-110m has been measured constantly from December.
Iori Mochizuki