The GYTC8S Figure 8 cable is constructed by inserting a 250μm fiber into a loose tube made of a high-modulus material filled with a water-repellent compound. The loose tube is coated with a double-sided plastic coated steel strip (PSP) longitudinally, and a water-blocking material is added between the steel strip and the loose tube to ensure compact and longitudinal water blocking of the cable, and the steel strand is integrated into an 8-shaped type. Inside the polyethylene sheath.