Thank you, I read the discussion there.
But I still have doubts. Users in that thread were trying to dismiss the possible negative implications for China's submarine fleet, claiming that it is merely an old design from the 1990s and so it shouldn't be concerning that it was detected. However, the submarine was a Type 93B, the most advanced submarine type currently operational in the PLAN (please correct me if I'm wrong.) Assuming that the capabilities of Chinese submarines advance progressively with the rollout of newer models, shouldn't it be one of the quietest submarines in China's fleet? Yes I know the Type 95 is in development, but none is currently operational. According to all accounts, the JMSDF detected, tracked and followed the Type 93B while it was still submerged. How does this not indicate an embarrassing level of noise created by the Chinese submarine - and, by extension, the entire PLAN submarine fleet?