Behold, It`s Submarine Communications Cable [Pic]. This is what it looks like. It`s laid on the sea floor between land-based stations to carry signals across the ocean.
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Wednesday, July 11, 2012 11:34:38 AM
The steel cables are for both protection against the pressure at depth and for the injection of high voltage DC to power repeaters along the sea floor.
Wednesday, July 11, 2012 9:18:24 AM
the steel cables are for strength, not rf shielding. To pull the cable up from the ocean floor, they drag a hook along the floor until they snag the cable, then pull it up. It has to be strong. Copper would be stupid to use for such a trunk cable, when fiber is available.