Underwater cable(GYTA33), the full-section water-blocking structure ensures good water-blocking and moisture-proof performance. The loose tube is filled with special grease to provide critical protection for the optical fiber. The phosphating steel wire center reinforcement member has a high modulus and corrosion resistance. The belt and thin round steel wire are wrapped and armored to ensure the mechanical compression, tensile and anti-elastic properties of the optical cable, and meet the application requirements of direct burial and underwater laying, low loss, low dispersion, compact and good comprehensive mechanical performance.