The construction of facilities needed for a planned release of treated radioactive wastewater into the sea next year from the damaged Fukushima nuclear power plant began Thursday despite opposition from the local fishing community.

Plant workers started construction of a pipeline to transport the wastewater from hillside storage tanks to a coastal facility before its planned release next year, according to the plant operator, Tokyo Electric Power Company Holdings.

The digging of an undersea tunnel was also to begin later Thursday.

Construction at the Fukushima Daiichi plant follows the Nuclear Regulation Authority’s formal approval last month of a detailed wastewater discharge plan that TEPCO submitted in December.

The government announced last year a decision to release the wastewater as a necessary step for the plant’s ongoing decommissioning.

A massive earthquake and tsunami in 2011 destroyed the Fukushima Daiichi plant’s cooling systems, causing triple meltdowns and the release of large amounts of radiation. Water that was used to cool the three damaged and highly radioactive reactor cores has since leaked into basements of the reactor buildings but was collected and stored in tanks.

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