More cable was commissioned in the last three years than in the previous decade. Route diversity did not improve at anything like the same rate.
Landing stations, not oceans
Cables converge on the same handful of coastal corridors because of permits, shallow-water geology and existing terrestrial backhaul. Four corridors carry a share of intercontinental traffic that makes network engineers uneasy.
Repair capacity is the second-order risk: the global fleet of cable ships is small, ageing, and already fully booked during storm season.
Redundancy on a map is not redundancy on the seabed.
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