Elisa has installed distributed acoustic sensing equipment on its undersea cables in Finland, turning the lines into long sensors that register vibrations from the sea floor. The system has been successfully tested and is being developed to automatically inform the Finnish Border Guard, the Finnish Navy and the cable owner when something unusual appears.
The move comes as concern over critical undersea infrastructure has sharpened after recent cable breaks. Jouni Petrow said Elisa’s quick response at the turn of the year prevented damage to other cables, and he framed the new setup as an early warning system meant to alert authorities before the first damage occurs.
Petrow called the protection of undersea infrastructure a nationally important task and said the company built the system with the recent incidents in mind. Undersea cables carry about 99% of global internet traffic, and transactions worth billions of dollars move over them every day, which is why countries are investing in new ways to defend them. Elisa said the system is cost-efficient and can be retrofitted onto existing cables, with a signal-listening device needed every 62 miles, or 100km.
That practicality is also where the unfinished part of the project shows. The detection system works in testing, but it is still being developed before it can automatically notify the authorities and the cable owner at full scale. Elisa acknowledged the involvement of Fingrid and Gasgrid Finland in the effort, signaling that the buildout is meant to reach beyond one company and into the wider network that keeps data and energy moving.
For now, the important step is not just that Elisa can hear trouble coming under the Baltic Sea, but that it is trying to turn those signals into an alert fast enough to matter. The open question is how quickly the automatic notifications move from development to routine use.
