Countries are gathering to prevent Japan dumping nuclear waste from the Fukushima power plant disaster into the ocean.
The plant suffered a catastrophic meltdown when a 6.6-magnitude earthquake shook the region in 2011.
A tsunami then swamped the nuclear reactors and triggered a massive radiation leak.
Tokyo Electric is currently running out of tank space at the plant used to store the water waste.
It expects storage will be taken up by mid-2022 and is actively seeking alternatives – one of which is reportedly the ocean.
The South Korean government has now sent a letter to the International Atomic Energy Agency (IAEA) in opposition to the move.