
“Extraordinary” amounts of toxic chemicals that were banned in the 1970s have been discovered in the bodies of sea creatures living at the bottom of the deepest ocean trench in the world.
Scientists were stunned to discover that such high levels of polychlorinated biphenyls (PCBs) and other persistent organic pollutants were to be found more than 10km (six miles) below sea level in the Mariana Trench in the Pacific Ocean. It is about 1,300km from the nearest major land mass, Japan.
And a similar situation was found about 7,000km away in the Kermadec trench, which is also more than 10km deep and about 1,500km north of New Zealand, the researchers reported in the journal Nature Ecology and Evolution.