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Deep Sea Mining Scar: 44 Years Later, Seabed Still Shows Wounds
2 Nov
Summary
- Deep-sea mining scars remain visible 44 years after 1979 experiment.
- Larger seabed animals dependent on mineral rocks are still scarce.
- Small seabed animals have returned to disturbed areas, but recovery is slow.
In 2025, scientists reported that deep-sea mining activities conducted in the Pacific Ocean in 1979 have left enduring changes to the seabed and its inhabitants. Research published in Nature examined a site where mineral-rich rocks were removed over four decades ago.
The study focused on the Clarion-Clipperton Zone, a region rich in polymetallic nodules. Researchers revisited the 1979 mining site in 2023, finding that the physical tracks left by the 100-tonne mining machine were still remarkably visible after 44 years. These tracks, approximately 8 meters wide, have persisted due to the slow processes and sparse animal populations typical of the deep sea.
While some smaller seabed animals and xenophyophores have recolonized the disturbed areas, larger creatures that rely on the mineral nodules for habitat remain scarce. This highlights the slow recovery rate of deep-sea ecosystems, as these nodules provide crucial attachment surfaces for organisms like sponges and corals.
Interestingly, the study found that sediment plumes, previously considered a significant threat, had limited long-term physical effects at the surveyed site. This contrasts with the clear, lasting consequences of direct habitat removal and physical disturbance, offering crucial evidence for future deep-sea mining decisions and the designation of protected areas.
