The operator of Japan’s crippled Fukushima Daiichi nuclear power plant has unveiled plans to build an underwater tunnel to release treated radioactive water into the sea. The Tokyo Electric Power (Tepco) submitted detailed plans on December 21, 2021, to the nuclear regulation authority for approval. In 2011, a devastating earthquake and tsunami sparked a nuclear disaster on Japan’s northeastern coast. Nearly 1.3 million tonnes of contaminated water has to be processed to eliminate radioactive…