"TOKYO — The operator of the wrecked Fukushima nuclear plant said Tuesday it has applied for approval from safety authorities to construct an undersea tunnel and other facilities needed for the planned release of large amounts of treated radioactive water into the sea.

The operator, Tokyo Electric Power Company Holdings, said it hopes to obtain approval from the Nuclear Regulation Authority to begin constructing the facilities in June and start releasing the water in April 2023.

The approval would cover the basic plan and design of the undersea tunnel, equipment to dilute the water with sea water and other necessary materials."

Mari Yamaguchi reports for the Associated Press December 21, 2021. [2]