Principle objective of this lecture is to present basic concept of Submarine Cable. Submarine cable is a cable laid about the sea bed concerning land-based stations to carry telecommunication signals across stretches of water. Subsequent generations connected with cables carried cell phone traffic, then files communications traffic. Modern cables work with optical fiber technology to carry digital data, which includes telephone, Internet along with private data targeted traffic. Here also briefly explain Special Equipments for Construction and International Submarine Cable.