Subsea installation of cables is a complex and time-consuming project that requires strict planning and execution. The following are the methods and steps for installing submarine cables:

1. Planning and design: Before installing submarine cables, it is necessary to carry out adequate planning and design to determine the path of the cables, identify the materials and equipment required, and carry out on-site surveys and measurements. This stage is crucial as it directly affects the smooth running of the subsequent works.

2. Preparation: In the actual installation work, it is necessary to prepare all the necessary materials and equipment in advance, including cables, anchor chains, buoys, winches, boats and so on. Meanwhile, safety equipment and personnel also need to be prepared to ensure safe construction.

3. Submarine construction: When carrying out submarine cable installation, it is first necessary to determine the starting point and end point of the cable, and then carry out submarine operations. Usually, the use of specialized operating vessels carrying cables and equipment, in the seabed operation. In the process of installing the cable, attention needs to be paid to avoid conflict with other submarine facilities or organisms, to maintain the stability and integrity of the cable.

4. Sea Surface Construction: After the cable has been installed to a certain extent, it is necessary to carry out sea surface construction, including connecting the cable to land facilities or other cables, testing and adjustment. Sea construction requires the cooperation of vessels and personnel to ensure that the operation is safe and smooth.

5. Completion and acceptance: After the cable installation is completed, completion and acceptance is required to ensure that the cable installation meets the technical requirements and specifications. Acceptance includes cable tension test, electrical test, etc., to ensure the normal use of the cable.

Overall, subsea cable installation is a complex project that requires careful planning and execution. Only by strictly following the installation steps and ensuring safe construction can we ensure the normal use and stable operation of the cable. We hope the above will be helpful to you.