At least 3,000 pieces of litter, with some dating back 30 years, can be found in the Pacific Ocean's Mariana Trench.
This information was obtained by researchers combing through the Deep-sea Debris Database operated by the Global Oceanographic Data Centre of the Japan Agency for Marine-Earth Science and Technology (JAMSTEC).
This vast online catalogue, which launched for public use in March 2017, contains photos and videos of debris collected by deep-sea submersibles and remotely operated vehicles from more than 5,000 dives.
According to the paper, authored by JAMSTEC researchers, more than 33 percent of the observed debris is macro-plastic, of which 89 percent was single-use products. The deepest record is a plastic bag at 36,000 feet in the Mariana Trench.