Seabed Dinosaur Fossils Now Threatened by Deep-Sea Mining Operations

As nations prepare to begin commercial deep-sea mining for critical minerals, scientists are raising urgent concerns that the activity could destroy some of the rarest dinosaur fossils on Earth — isolated bones that have lain undisturbed on the ocean floor for more than 100 million years.

These fossils, such as the record 2,256-metre-deep Plateosaurus phalanx from the North Sea and scattered theropod and hadrosaur fragments recovered from Pacific cores at depths up to 4,800 metres, reached the seafloor through the well-documented “bloat and float” process. After death, dinosaur carcᴀsses drifted offshore, sank, and were buried in marine sediment. Over tens of millions of years, they were carried deeper by sedimentation and tectonic subsidence.

Although these bones are extremely rare — always fragmentary and mixed with marine fossils — each specimen is scientifically invaluable. They provide direct evidence of how terrestrial dinosaurs interacted with ancient coastlines and how plate tectonics has reshaped the planet’s surface.

Deep-sea mining, particularly in the Clarion-Clipperton Zone of the Pacific, targets polymetallic nodules lying on the abyssal plain. The heavy machinery required would scrape, crush, and bury anything in its path. While the probability of hitting a dinosaur bone is low, the potential loss is permanent.

Palaeontologists are calling for mandatory pre-mining surveys, protected zones, and international protocols to safeguard these irreplaceable specimens before commercial operations begin. The same technology that accidentally revealed the world’s deepest dinosaur fossil could now erase the next one before it is ever studied.

From the abyssal plains, these ancient bones face an entirely modern threat — one that underscores both their rarity and their enduring scientific value.