Chen-4 bottom mine

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Sinking-4 (沉-4, or Chen-4) bottom mine is a small naval mine with none contact fuses, and it is jointly developed by the 710th Research Institute and the Eastern Wind Instrumentation Factory (东风仪表厂). This mine is the bottom mine counterpart of the Drifting-2 drifting mine, and like the latter, this mine can be taken apart for easy transportation and reassembled just prior to being planted. Thanks to the special attachments of this small bottom mine, the fuse section and the warhead section of this mine can be installed on any Chinese naval mines, thus increasing its versatility.