Here is a thumbnail of China's subs:
https://www.nti.org/analysis/articles/china-submarine-capabilities/
Of course china can build Subs in 4 years ofr less as it can build aircraft carriers
while it take the USA 3 times as long. Our mob will take 20 years to build/commission
these subs and let's hope hat they wont be obsolete before the hit the water
