https://interestingengineering.com/military/us-eu-navies-submarine-hunting-sonars
US, EU navies to use 750,000-mile cable network to track submarines
Oct 10, 2025 - Undersea fiber-optic cables, which stretch over 750,000 miles across the ocean floor, are being used in a new way for anti-submarine warfare.
useunaviesmilecable