How 1.5 million km of undersea internet cables can double up as an earthquake and tsunami warning system

Predicting earthquakes is a daunting challenge on land, but in the oceans, which cover about 70% of the Earth’s surface, it is virtually impossible. However, the vast network of submarine cables crisscrossing the world’s seas could soon change that. In addition to transmitting data across the planet, they can also monitor the tectonic movements that cause earthquakes and tsunamis.