Chen-4 bottom mine

The Chen-4 or Sinking-4 (沉-4, or Chen-4) naval mine is a small Chinese bottom mine with non-contact fuses. It was jointly developed by the 710th Research Institute of Chinese Shipbuilding and the Dongfeng Instrument Factory (东风仪表厂). This bottom mine is the counterpart of the Drifting-2 drifting mine and like the latter, it can be disassembled for easy transportation and then reassembled prior to being deployed.

Bottom Mine

A mine with negative buoyancy which remains on the seabed. Also called a ground mine.