The installation of submarine cable accessories includes the installation of submarine cable anchorage devices, protection devices, cable ends and joints, and cable grounding devices, which is a major part in the construction process of submarine cable. The submarine cable accessories are transported together with submarine cables, which should be constructed at the same time under normal situation. When installing accessories, it is necessary to follow the requirements of the accessory manufacturer, strictly control the installation quality, and avoid rework and defects. For unconventional situations such as underwater removal of submarine cable accessories during submarine cable maintenance and construction, our company has participated in a number of optical cable maintenance projects on islands and main submarine cable maintenance projects of the wind farm, and has rich experience in the repair and removal of underwater submarine cable faults and the installation and removal of accessories.