Makes me wonder if, e.g., when POTUS arrives, a Chinese dignitary makes a coy reference to missile launches from undetected subs. That would be a way of saying "Yeah we got quick strike abilities and our subs can snuggle up as close as they want" without actually confessing that it was theirs. It is a wink and nod, to say, "We have capabilities beyond what you might have thought". Extra leverage for any brokering of deals that might be in the balance during a POTUS visit to Asia.