Chen-3 bottom mine

The Sinking-3 (沉-3, or Chen-3) is a Chinese naval mine. It was is the successor of Sinking-2 (Chen-2) bottom mine, and it was jointly developed by the Vanguard Instrumentation Factory (前卫仪表厂) and Suzhou Maritime Machinery Factory (苏州船用机械厂) in 1974. In comparison to its processor, this mine is the first in the Chinese inventory to adopt combined fuses instead of being only able to have a single type of fuse. Currently, all Sinking-3 bottom mines are upgraded to the Sinking-3-II (Chen-3Yi) standard and this latest version is a fully solid state model. The upgrades were done by the Vanguard Instrumentation Factory.