1. The cable can be laid under water, to avoid direct sunlight, wind and rain. That will reduce aging rate and improve service life of cable.
2. The low temperature ambient under water can keep the cable cool, that can improve the conductivity greatly.
3. No need of piling, cable bridge or floating body when laying, and easy for laying, that can reduce manual labor and save laying cost greatly.
4. As the cable is laid through the water directly, the shortest straight path can be designed, that will reduce purchasing quantity, to reduce purchasing cost.
5. It should be more beautiful without laid over water, and can keep channel clear. And the maintenance should be more convenient for the future.