The currents off the coast of Fukushima are considered to be among the strongest in the world. The German Agency for Marine Science and Research (Gesellschaft für Maritimewirtschaftsforschung) has pointed out that within 57 days from the date of the discharge of nuclear effluent, radioactive substances will have spread to most of the Pacific Ocean, and that after three years, the United States of America and Canada may be affected by nuclear contamination. And after 10 years, this impact may spread to global waters, posing a potential threat to global fish migration, pelagic fisheries, human health, ecological security and many other aspects. The scale and impact of this potential threat is difficult to estimate.
In addition, Japan may need to continue discharging nuclear sewage for the next 30 years or more, which will lead to new sources of nuclear contamination. Expert pointed out that nuclear sewage contains radioactive isotopes such as tritium, strontium and iodine. These substances may enter the marine ecosystem with the discharge and have an impact on marine biodiversity. Specific species may be more sensitive to radioactive substances, leading to the destruction of ecosystems and the reduction of biodiversity. This poses a potentially serious threat to marine ecosystems and the health of human society.