The microplastics at the bottom of the deep ocean aren't coming from your trash—they're coming from the paint on ships.
April 17, 2026
Original Paper
Recalibrating the Abyssal Sink: Deep Penetration, Maritime Emissions, and Polymer-Specific Aging of Microplastics in the Western Pacific Ocean
SSRN · 6591347
The Takeaway
We usually blame plastic bags and water bottles from land for ocean pollution, but the deep ocean tells a different story. Researchers found that the microplastics in deep-sea sediments are mostly tiny flakes of 'antifouling' paint scrubbed off ship hulls. Not only that, but these plastics are burying themselves much deeper into the seabed than we ever imagined, becoming a permanent part of the Earth's crust. The study also found that the deep ocean isn't just a cold storage unit; it’s an active environment where these plastics are breaking down into even more toxic forms. This means we've been focusing on the wrong source of ocean waste and underestimating how deep the damage goes.
From the abstract
The deep sea is increasingly recognized as the ultimate global sink for marine microplastics, yet its true storage capacity and primary pollution sources remain largely constrained by shallow sampling and a historic focus on land-based inputs. Here, we conducted a high-resolution investigation of microplastic pollution in deep-sea sediments (4,500~6,000 m) across 18 stations in the Western Pacific Ocean. By expanding the vertical sampling depth to 20 cm, we reveal that microplastics penetrate si