Why Most Subsea Cable Failures Stay Out of the News

Submarine cables underpin international communications, and faults happen often—typically two to four each week around the world. Most damage comes from fishing gear, anchors, or natural events such as undersea earthquakes, but carriers spread capacity across multiple routes so service usually continues. Deliberate sabotage is rare, though breaks can hit several cables at once where they are forced into shared corridors.

Subsea faults occur frequently, with global averages of two to four weekly. Damage usually stems from outside forces—fishing equipment, anchor activity, or seabed earthquakes—while component failures account for fewer incidents. Because providers route traffic across several cables and retain standby repair ships, single breaks often go unnoticed by users.

Where cables are squeezed into shared paths by geology or regulation, one event can sever several links at once. Intentional state sabotage is uncommon; known cases are mostly historic. Fishermen sometimes cut cables after snagging them, and operators may compensate for sacrificed gear. AIS records can help link a vessel's position to a break.