The deep sea is one of the least explored environments on Earth, yet it has increasingly become the final destination for ocean plastic. New research shows that even at depths of more than 5,000 metres, large quantities of plastic waste are accumulating on the seafloor. The deep ocean is rapidly turning into a global dumping ground.
Plastic Pollution in the Deep Sea: Discoveries in the Calypso Deep
During a research expedition using the submersible Limiting Factor, scientists discovered significant amounts of waste in the Calypso Deep in the Ionian Sea. At 5,122 metres, it is the deepest point in the Mediterranean Sea.
Instead of finding an untouched marine environment, researchers encountered a seafloor littered with waste. Documented items included plastic bottles, plastic bags, beverage cans, glass bottles, and various other types of debris, providing further evidence of the growing problem of plastic pollution in the world's oceans.
The findings, published in the Marine Pollution Bulletin, highlight both the scale of the issue and the increasing contamination of even the most remote marine environments.
How Waste Reaches the Deep Ocean
Most of the waste discovered in the Calypso Deep is believed to originate from the southern Mediterranean region. Ocean currents, eddies, and sediment transport processes gradually carry debris across long distances before it eventually settles in deep-sea environments.
The Calypso Deep acts as a natural accumulation zone for marine litter. Weak currents, a basin-like structure, and limited water circulation create conditions that allow waste to collect and remain on the seafloor for extended periods.
In some cases, sediment patterns even suggest that certain items may have been directly discarded from vessels. Approximately 88% of the documented waste consisted of plastic, including bags, packaging materials, cups, bottles, and other single-use products.
Deep-Sea Litter: An Invisible Environmental Crisis
The deep sea represents the final destination for much of the plastic that enters the ocean. At these extreme depths, decomposition processes occur very slowly, meaning that plastic can remain in the environment for decades or even centuries.
These findings demonstrate that deep-sea litter is not an isolated phenomenon but part of a global environmental crisis. Once plastic enters the ocean, it can spread throughout the entire water column and contribute to long-term marine pollution across the globe.
While the full ecological impact on deep-sea ecosystems is still being studied, researchers warn that increasing levels of pollution may pose growing risks to marine habitats and biodiversity.
The Need for Action Against Ocean Plastic
The discoveries in the Calypso Deep serve as a stark reminder that plastic pollution is a global problem. Waste enters the ocean through rivers, coastal regions, maritime activities, and inadequate waste management systems before eventually reaching even the deepest parts of the planet.
Addressing ocean plastic pollution requires both effective policy measures and broader societal change. Reducing plastic consumption, improving waste management systems, and strengthening recycling infrastructure are essential steps toward preventing waste from entering the environment in the first place.
everwave in Albania: Stopping Plastic Before It Reaches the Sea
Europe also plays a role in addressing global marine pollution. In addition to domestic waste generation, the export of waste to countries with limited waste management infrastructure contributes to the problem.
Albania is one example where many regions still lack effective waste management systems, increasing the risk of plastic waste entering the environment.
This is where everwave's project site in Kukës, located along the Drin River, comes into play. The Drin ultimately flows into the Mediterranean Sea, meaning that unmanaged waste can potentially contribute to marine plastic pollution.
Using a stationary waste collection boat, everwave removes waste directly from the river before it can reach the sea. At local Zero-Waste Centers, the collected material is sorted and prepared for further processing and recycling.
By intercepting waste upstream, these efforts help prevent the deep-sea waste problem from growing further while making a direct contribution to reducing plastic pollution in the Mediterranean.
Conclusion: Plastic Pollution Reaches Even the Most Remote Places
The discovery of waste more than 5,000 metres below the ocean surface demonstrates the far-reaching consequences of plastic pollution. Even the most remote and least explored parts of our planet are no longer untouched by human waste.
Protecting the oceans will require global solutions across the entire value chain, from reducing waste generation and improving waste management systems to increasing recycling rates and actively removing plastic from rivers before it reaches the sea.
Only by combining prevention, infrastructure development, and cleanup efforts can we effectively reduce marine plastic pollution and protect ocean ecosystems for future generations.