Marine

A proven experience in all aspects of installation, worldwide

The planning and implementation of marine operations is critical to the success and long term reliability of a submarine cable. The operations cover a wide range of different activities running throughout the life of a project.
Alcatel-Lucent and its predecessor companies have been installing submarine cables for over 140 years and has the in-house skills and experience to manage the entire solution.

1. The marine operation begins with the cable being ‘floated’ ashore to the landing position from the cable ship. The cable is ‘floated’ ashore to prevent damage to both the seabed and the cable. Once the cable end is ashore and secure, the floatation bags are removed s removed and the cable settles to the seabed.
   
2. The cableship follows the pre-determinated route and the cable is buried or surface-laid as required. Continuous adjustments are made to ‘slack’ and vessel position to ensure a good conformity of cable to the seabed.
   
3. Upon arrival at the other cable end (previously installed and buoyed off) the position of the laying vessel is adjusted until both cable ends are on board. A final splice cable joint is made.
   
4. Upon completion of the final splice joint, the cable bight is lowered overboard and deployed on the seabed

1. The fault is initially located by testing from the terminal stations. The repair ship can recover the cable using a variety of grapnels. The grapnel is lowered from the repair vessel and traverses the cable line on the seabed. A grapnel is a special device that can simultaneously cut and seize cables.
   
2. After the cable is found and hooked by the grapnel , it is cut in situ and one end is raised and brought onto the ship.
   
3. A buoy is attached to the end of the recovered cable, which is then replaced on the ocean floor. Recovery of the other cable end with the grapnel then proceeds.
   
4. After the other end of the cable is recovered on board and the faulty cable section is removed, replacement cable is jointed in and the cable is deployed back to the buoy.
   
5. The end of the cable attached to the buoy is brought aboard, and it is spliced to the replacement cable.
   
6. After a series of tests, the cable is released and lowered/lowered onto the ocean floor.