Tokyo Electric Power Company (TEPCO) began offshore drilling operations on Monday for the undersea tunnel that will implement its plan to release radioactive water from the Fukushima nuclear plant into the Pacific Ocean, local media has reported.

TEPCO is scheduled to initiate the release in the spring of 2023.

The Japanese operator of the Fukushima Daiichi nuclear plant has decided to release treated wastewater from the ruined facility in an area roughly 1 kilometer offshore from the site, reported Nikkei.

Tokyo Electric Power Co. Holdings plans to discharge the wastewater through a pipeline, which will be contained in a tunnel to be drilled within the seafloor, said the report.