It appears there is a thought to use underwater fibre optic cables to detect earthquakes
https://www.sciencenews.org/article/underwater-fiber-optic-cables-could-moonlight-earthquake-sensors
It appears there is a thought to use underwater fibre optic cables to detect earthquakes
https://www.sciencenews.org/article/underwater-fiber-optic-cables-could-moonlight-earthquake-sensors