The Fiber In Metal Tube (FIMT) provides effective protection against water ingress, mechanical & external forces and prevents hydrogen induced loss. The inner armour consists of two layers of high strength steel wire surrounded by compound. The copper conductor can be used to apply power for subsea repeaters and an electrical tone for cable tracking, depth of burial measurement and fault location. The LW cable core can be armoured with single or double layers of GSW to give the cable increased tensile strength, excellent abrasion protection and enhanced crush and impact resistance. Asphalt is added onto the armor, rope and sheath. And it is suitable for long distance repeatered optical transmission systems with maximum 600 meters water depth. Its operation and installation temperature ranges from -10℃ to 40℃,and the storage temperature ranges from -30℃ to 60℃.