Strange new discovery in Bermuda Triangle stuns scientists: 20-km-thick rock layer found beneath surface

Scientists have identified an unusually thick rock layer deep beneath the Bermuda Triangle, revealing a geological feature unlike anything previously documented. The structure, measuring about 20 kilometres in thickness, lies below the oceanic crust and within the tectonic plate beneath Bermuda. The discovery, reported in the journal Geophysical Research Letters, is based on seismic analysis of distant earthquakes and may help explain why the seafloor in this region remains elevated despite the absence of volcanic activity for tens of millions of years.

Bermuda Triangle reveals unexpected structure beneath the crust

Using seismic recordings from earthquakes around the world, researchers examined how seismic waves changed as they travelled through Earth beneath Bermuda. Instead of transitioning directly from oceanic crust to mantle, the data revealed an additional, unusually thick rock layer. Scientists say this type of structure has not been identified in other comparable oceanic regions.




Bermuda sits atop an oceanic swell, where the seafloor stands higher than surrounding areas. Such features are typically linked to active volcanic hotspots, yet Bermuda’s last known eruption occurred about 31 million years ago. Researchers suggest the newly identified rock layer may provide long-term buoyancy, preventing the region from subsiding over geological time.

The study indicates that the rock layer likely formed when molten material from the mantle was injected into the crust during Bermuda’s volcanic past and later cooled in place. The material appears to be less dense than surrounding rock, a property that could contribute to the sustained elevation of the seafloor.

Previous research shows that Bermuda’s lavas are unusually rich in carbon and originate from deep within the mantle. Scientists believe this material may have been emplaced during geological processes associated with the breakup of the ancient supercontinent Pangea, making Bermuda’s geological history distinct from that of many other volcanic islands.

Why the discovery matters for Earth science

The presence of such a thick sub-crustal layer challenges existing models of oceanic crust formation and evolution. Researchers say studying rare and extreme geological settings like Bermuda helps refine understanding of how Earth’s interior behaves over long timescales.

What scientists are studying next

Researchers are now analysing seismic data from other islands and oceanic regions to determine whether similar structures exist elsewhere. Future studies aim to establish whether Bermuda represents a unique case or part of a broader, previously unrecognised geological process.