What lies beneath: the growing threat to the hidden network of cables that power the internet

Last month large parts of Tonga were left without internet when an undersea cable was broken. It’s a scenario that is far more common than is understood

It was the opening days of 2022, in the aftermath of a huge volcanic eruption, when Tonga went dark. The underwater eruption – 1,000 times more powerful than the bomb that was dropped on Hiroshima – sent tsunami waves across Tonga’s nearby archipelago and blanketed the island’s white coral sands in ash.

The strength of the Hunga-Tonga-Hunga-Ha’apai eruption severed internet connectivity with Tonga, causing a communication blackout at just the moment that a crisis was unfolding.