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Even if the Submarine Cable Laying is laid perfectly, the optical cable is easily damaged. Sometimes ships passing by or at anchor will accidentally touch the optical cable, and large fish will accidentally damage the optical cable shell. The 2006 earthquake in Taiwan caused damage to many optical cables, and even enemy forces would deliberately damage optical cables.
Submarine Cable Repairing is not an easy task, because small damages can cause the cable to be paralyzed. It takes a lot of manpower and material resources to find a small gap in the tens of thousands of kilometers of optical cable.
Finding a problematic cable with a diameter of less than 10 cm from the the seabed at a depth of several hundred meters or even thousands of meters is like finding a needle in a haystack, and it is very difficult to reconnect after repair.
Repairing the optical cable first needs to determine the approximate location of the damage by transmitting signals from both ends of the optical cable, then send a robot to accurately locate and cut this section of optical cable, and finally, connect the spare optical cable. But the connection process will be completed on the surface of the water, and the optical cable will be lifted to the surface by the towing boat, connected and repaired by an engineer, and then placed on the seabed.
When Britain erected the world's first submarine cable in 1858, China was in the midst of opium-smoked miasma. It was not until 1988 that China laid the first submarine cable. After thirty years, China's submarine optical cable technology has ranked among the world's top.
At present, the second-generation submarine optical cable developed by China has begun to be built and laid. The United States and Japan only started using the same type of optical cable last year. The speed of China's submarine optical cable core index drawing technology has reached 2800m/min, which is faster than the 2000m/min in the United States. At the same time, the Submarine Cable Laying Company is about to build a 6000km submarine optical cable connecting South America and Africa, breaking the monopoly of American manufacturers in the submarine optical cable market.