CTD cable USES a single core cable to supply power to underwater equipment and transmit data of underwater equipment in real time, which has been widely used in deep-sea Marine measuring instruments, such as CTD, sensor, water extractor, and current meter. The length of CTD cable is generally 6000m to 10000m, the outer diameter is from 2.56mm to 9.53mm, of which 9.53mm and 8.03mm are the most commonly used specifications, and the maximum breaking force can reach 6.5 tons. It is widely used in various scientific research ships in China, such as ocean no.1, science no.