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Run silent, run deep: Shang-class subs prove stealthy

Experts say China's Shang class ballistic missile submarine may be as stealthy as Los Angeles class US submarines

"Russia’s seven-bladed Akula (Shark) class submarines, which were first designed and built in the mid 1980s, are now reputed to be quieter than the majority of their American counterparts, thanks to intelligence from US spies John Walker and Jerry Whitworth.

According to the naval expert H. I. Sutton, Chinese submarine designs and manufacturing were initially far behind that of the US, the report said.

In an article for Forbes Magazine, he explained that, “the aim is to make the submarine as quiet as the ambient sea noise around it, typically around 90 decibels. Western submarines got close around 20-30 years ago. China has been seen as lagging.”

Sutton described how the Shang-class may be getting as quiet as some of the US Navy’s quieter subs, “according to unclassified US Navy estimates, the early Type-093 attack submarines are about 110 decibels. That is about the same as the US Navy’s improved Los Angeles Class boats,” which were built in 1982, the report said."

https://asiatimes.com/2020/04/run-silent-run-deep-shang-class-subs-set-new-standard/