Can somebody explain how capable are Chinese at Anti submarine warfare , cause i heard American submarines are quieter then a school of small plankton thats really quiet , my uncle Jack told me this hes a retired WW2 submariner , Uss Caiman SS 323
It doesn't matter how quiet you are when the ASW ship starts pinging because detection is based on reflecting sound waves, not quietness. The only thing a submarine can do is depend on their coatings to absorb the sound waves, which doesn't always work, and to use thermoclines --- different layers of water with different salinity and temperature variations --- to reflect these sound waves.
So the ASW ship or helicopter will use a VDS or variable depth sonar, which it tows behind the ship and it can lower through the thermocline, and starts pinging.
A lot of Chinese warships have VDS as a standard, including Type 056A corvettes and Type 054A frigates.