World Internet Submarine Cable Under Sea By CCIE Academy
The cables are specially constructed for submarine operations as they have to endure harsh conditions as well as pressure. Fiber optic cables carry DWDM [Dense Wavelength Division Multiplexing] laser signals at a rate of terabytes per second. They use optical repeaters to strengthen the signal which attenuates over long distances.
They have a decade lifespan and costs vary (depending on the length of the cable). The typical cost for a project is anywhere from $150m-$550m. We don't use satellites because they can't carry terabytes of data for less than a billion dollars per communication line.
The coiling of hundreds of miles of cable in the cargo hold is a process that can take between four to five weeks to complete.
World Internet Submarine Cable Under water By CCIE Academy
Submarine cable laying process starts from the landing station and where a long cable section is attached to the landing point and then extended out to a few miles in the sea. This end is connected to the cable on the ship and then the ship starts its cable laying process.
Depending on where the cable is laid out, the cable coming in from the ocean to the landing station might be advertised or not. Most of the time cable consortium companies try to hide the cable as much as they can, so that only those who need to know – municipalities, port authorities and shipping companies – are informed of the exact route of the cable.
When cables are damaged, either divers or specialized small submersibles with cameras and lights are sent down to the seabed to investigate where the cuts are. Then, either the divers or robotic arms on the submersible bring the two ends of the cable to the surface, where they are re-spliced and joined again
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