The Internet Runs on Cables Repaired by a Fleet Small Enough to Count

Almost all intercontinental data moves through submarine fibre-optic cables, and those cables break regularly. The causes are mundane: fishing gear and ship anchors in shallow coastal waters account for the substantial majority, with seabed movement and equipment failure making up most of the remainder. Faults numbering in the low hundreds per year worldwide are the ordinary operating condition of the system, not a crisis — the network is built with enough path diversity that most breaks are invisible to users. What makes the topic strategically interesting is the repair side. Fixing a submarine cable requires a purpose-built vessel that can locate the fault, grapple the cable off the seabed, lift it to the surface, splice in a replacement section and lay it back down — work that takes days once the ship is on station, and that cannot be done by any other kind of vessel. The global fleet capable of this is small enough that an interested person could list it, much of it is well into middle age, and its distribution is uneven: some ocean regions have a ship within days, others do not. The consequence is that repair time is dominated by queueing and transit rather than by the repair itself. When several faults occur in the same region within a short period — a storm season, an area of heavy anchor traffic, a stretch of contested water where permits are slow — the delay compounds, because the same ship must complete one job before starting the next. That is precisely the scenario in which redundancy stops helping: path diversity protects against one break, not against a regional queue. For organisations whose operations depend on specific routes, the useful discipline is knowing which cables their traffic actually traverses, which is rarely obvious from a connectivity contract. Two providers advertising diverse paths can share a landing station, a segment, or the same repair coverage gap. The infrastructure is remarkably reliable in ordinary conditions and remarkably thin in the specific dimension that determines how long a bad week lasts.