The specialized-1 (特-1, or Te-1) rocket propelled mine, also known as the EM-52, was developed by the 710th Research Institute in 1981, and completed by 1987 after more than 100 major design changes. Specialized-1 mines are planted by surface ships in up to  of water.
The specialized-1 (特-1, or Te-1) rocket propelled mine, also referred to as the EM-52, was created by the 710th Research Institute in 1981 and underwent significant design improvements before being completed after more than 100 modifications by 1987. Specialized-1 mines are deployed by surface vessels at depths of up to .