Scientists in China have discovered that powerful underwater currents strong enough to snap or bury deep sea cables are happening far more often than anyone realized. The finding upends long held assumptions about the stability of the ocean floor and the safety of the global internet.
A hidden threat beneath the waves
Researchers from the Chinese Academy of Sciences analyzed data from instruments placed on the seabed in the South China Sea. They found that supercurrents, fast moving flows of water near the ocean floor, occur with surprising frequency. These currents can shift sediment, expose cables, or break them entirely. The team reported that such events are not rare anomalies but regular occurrences in certain regions.
Why this matters for the world's internet
More than 95 percent of global data traffic travels through undersea cables. These cables are the physical backbone of the internet, connecting continents and carrying everything from financial transactions to video calls. If a cable is damaged by a supercurrent, it can disrupt communications for millions of people. Repairing a deep sea cable is expensive and slow, often requiring specialized ships and weeks of work.
The study focused on the South China Sea, a region dense with submarine cables. Local authorities and telecom companies in China have long worried about cable breaks. The new data suggests the risk is higher than previously modeled. Scientists used acoustic instruments and current meters placed on the seafloor to track the speed and frequency of these flows over time.
A wake up call for cable planners
The research indicates that cable routes may need to be re evaluated. Areas once considered safe could be more active than assumed. The findings also suggest that climate change might be altering ocean circulation patterns, potentially making supercurrents even more common. However, the study did not directly link the increased frequency to climate change.
For now, the message is clear. The ocean floor is not a quiet, stable place. It is dynamic and sometimes violent. Engineers laying new cables will need better data to avoid the most dangerous zones. The global network that runs beneath the sea is more vulnerable than the world knew.
