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How is the Submarine Cable Laid?

The submarine communication cable is a wire wrapped with insulating material and laid on the seabed to complete the telecommunications transmission between countries. The first batch of submarine communication cables were used to supply telegraph communications, and later began to introduce telephone communications and Internet communications. Modern fiber optic cables also used fiber optic skills and were therefore called submarine cables.

How to lay?

To put it simply, the submarine cable laying is to place the cable on the submarine cable laying ship, and then the ship slowly moves to sink the cable into the sea floor.

Specifically, the cable laying mainly includes three stages of cable routing and cleaning, cable laying and burying protection. Cable laying is usually done by a cable burying machine that dives the bottom of the sea. It is a bit like a plough used in ploughing, towed by a submarine cable laying ship, and made various commands through the working cable. There are several rows of water spray holes at the bottom. During operation, each hole simultaneously sprays a high-pressure water column to the seabed, and the seabed sediment is washed away to form a cable trench. The upper part of the device has a cable guide for guiding the cable (cable) to the bottom of the cable trench.

In the past, sea currents were often used to cover the sand naturally over the ditch to save time in burying the cable. Nowadays, an underwater robot equipped with a high-pressure water pump is usually used to punch a ditch and then put it in and then bury the soil.


When the cable is laid, the navigation speed of the laying ship and the cable release speed should be controlled to control the water inlet angle and the tension of the cable to avoid damage to the cable due to too small bending radius or excessive tension. When the deep sea section is laid, the cable laying ship releases the optical cable, and continuously monitors and adjusts the underwater monitor and the underwater remote control vehicle to control the forward speed, direction and speed of laying the cable to avoid the unevenness. And rock to avoid damage to the fiber optic cable.

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