A book excerpt details Tonga's 2022 internet outage after a colossal underwater volcanic eruption ripped apart the cables connecting the country to the world
www.theguardian.com/news/2025/ se... Sarah Pinsker / @sarahpinsker : This is a fascinating article about our connected world and what happens when the connections stop. — www.theguardian.com/news/2025/ se...
Context & Ripple Effects
The excerpt revisits a failure first documented in coverage of Tonga’s blackout after the volcano, when damage to the country’s sole undersea connection cut it off from the global internet. It matters because the disruption was tied to a physical chokepoint rather than an ordinary service outage.
Related coverage places Tonga alongside other cable disruptions, including the West African cable failures caused by a submarine canyon, underscoring how geography and route concentration can determine digital resilience.
First-order effects
- The eruption’s damage to Tonga’s sole undersea cable immediately severed the country’s internet connectivity, leaving residents and organizations without their normal link to external networks.
- The incident made cable repair and restoration—not local internet-service operations—the critical path to reconnecting Tonga.
Second-order effects
- A single-route outage concentrates pressure on network operators and public authorities to plan backup connectivity and restoration procedures for failures beyond their direct control.
- The episode reinforces the operational importance of subsea-cable maintenance: related research found many faults stem from fishing equipment or anchors, making resilience a recurring network-management issue rather than a one-off disaster concern.
Third-order effects
- If countries remain dependent on one or very few international cable routes, internet reliability will increasingly be shaped by infrastructure diversity and physical-risk planning as much as by domestic network capacity.
- The broader implication is a more explicit resilience trade-off: redundant routes can reduce isolation risk, but require sustained investment in systems whose value is most visible only during rare disruptions.
The trend: Tonga is one data point in the growing recognition that digital connectivity depends on vulnerable, geographically concentrated subsea infrastructure.