Underwater avalanches can outrun surface ocean currents
Deep beneath the waves, massive slurries of mud and sand roar through canyons at highway speeds, snapping heavy fiber-optic cables like brittle sewing thread.
Deep-sea communication cables are designed to withstand the crushing pressure of the abyss, yet they are frequently defeated by gravity and mud. These failures are often caused by turbidity currents, which are essentially underwater avalanches of dense, sediment-laden water that funnel through submarine canyons. Unlike the slow, drifting currents at the ocean surface, these bottom-dwelling flows can accelerate to over 20 meters per second. This is fast enough to outrun many surface vessels and exert enough force to snap sophisticated glass-and-steel cables in an instant.