"Beyond 1500 meters from the shoreline, builders typically lay unarmored cable directly on the seabed ... a few reach depths greater than 8000 meters."
Not much of an answer. How the heck do they lay it and control slack at greater than 8000 meters? How do they verify the cable is on the seabed at those depths?
"Beyond 1500 meters from the shoreline, builders typically lay unarmored cable directly on the seabed ... a few reach depths greater than 8000 meters."