It was a calculated move. Nothing wrong about that.
Premise -- That a Song-class submarine shadowed undetected a US aircraft carrier battlegroup, presumably also undetected by the group's sub escorts. Then just for show-and-tell, the Chinese sub surfaced in plain view of all.
Argument -- From a strict military perspective, what could be gained by China with this? Just about %99 of a submarine is 'classified', especially its screws in construction and design. So why would China expose this seemingly improved capability to a potential adversary, especially one that dominated the oceans, even to China's backyard, for so many decades? Again --
WHAT IS THE TACTICAL AND/OR STRATEGIC GAIN FOR CHINA? It make no logical sense. The collapse of the Soviet Union, once China's sponsor, and the decline and currently plateauing of the Russian military, is a great opportunity for China to surpass Russia in terms of military prominence. China does not need to achieve parity of forces with the US, only eclipse the Russians and that still has some ways to go. But China cannot do that if the US, by hook or by crook, is aware of China's military progress.
We have no credible
TECHNICAL information on how this Song-class sub eluded US sensors. For all we know, it may not even be technical but merely from the stationing of the group's ships that created a 'blind' area where US sonar is not as effective. Anyone who ever served in a military would know that the military is an inherently conservative organization, not necessarily resistant to change but rather cautious to change, and that this would be the standard layout of the entire US carrier force and it would take a lot of convincing for the US Navy to change. So if this tale is true, what would be more compelling for a change by having a potential adversary's submarine showing off his cards? The US Navy would immediately reassess how the fleet operate, everything from array to speed, to find this 'blind spot'. China, by foolishly surfacing this sub, now lost a great tactical advantage. For what? Just so a few Chinese kids could have bragging rights on anonymous Internet forums? Do you really think what you spew here matter to China's admiralty, who has the weight of an entire nation on their shoulders?
Counter-argument --
...why stupid China reveals its secret capability of destroying satellite?
The question implied two things:
1 - That China
ELECT to reveal an anti-satellite capability.
2 - That in having option, China could also
NOT reveal said anti-satellite capability.
Unfortunately, currently it is not possible to conceal a missile launch due a constellation of satellites, imagers or non-visible spectrum sensors, that covers the Earth. So if implication two is invalid, the entire counter-argument is invalid. This leads back to the original question -- What is the tactical and/or strategic gain for China in revealing the ability to elude US sonars? Saying that 'It was a calculated move' without saying what are the consequences of such a move means nothing. The readers of your argument learned nothing other than the fact that it is a vacuous statement intended to give a facade of knowledge. Nothing more. Calculated to give the US a status report of China's military progress? Gee whiz...Thanks a bunch. Our sub skippers will certainly toast the PLAN with their morning coffees.
Just as when India exploded their first nuke, they wanted to enter the "exclusive club". I'm sure they knew there would be years of protest and sanctions, so why did they do it then and there?
For an indigenous aviation program, the best way to prove that such a program is a success is to actually fly a model. Same for an indigenous nuclear weapons program. To date, the only way to verify that such a program is a success is to actually detonate a functional nuclear warhead. To date, it is not possible to conceal such an event.
IF it is possible to simulate in a computer a nuclear warhead with better than %95 certainty that such a program is accurate, do you really think that any country would reveal it is finally a nuclear weapons state, especially when there is a hostile neighbor? For the military, it is desirable to keep enemies and potential enemies ignorant of one's own capabilities in everything.
So is it possible to conceal the fact that a sub could sneak around undetected? Of course it is. Just sneak up to the enemy, take your readings, go home and keep your mouth shut. Concealability is why subs were invented in the first place -- to conceal a weapon platform from view. So why on Earth would you want to reveal to enemies and potential enemies that you can go underwater when none of them can? If they are numerically superior to you in terms of surface ships, it would be more crucial that you keep such a program secret. This continues to lead back to the original question -- What is China's gain in revealing
TO THE WORLD that Chinese subs can sneak around undetected, especially when a potential adversary already enjoys a considerable technological advantage in every area?
And
YOU call me 'slow'?
To send a message, because eventually you reveal your hand.
The best time to 'reveal your hand' is when you are in a conflict, or when you enjoy a gross advantage in whatever area in question. If I successfully deploy one submarine while my potential enemies cannot, it would be foolish to reveal what I can do. I have only one boat and it cannot be everywhere at once. But if I am patient and build up a fleet that can cover my territorial waters, then as deterrent it is now logical to let my potential enemies know what they will face should there be a war between us.
And
YOU call me 'slow'?
The more this story is examined with a critical eye the more absurd it become. In the remote possibility that China is truly incredibly that stupid to reveal such a capability, the US is more than willing to take this black eye to learn how to counter the new threat. And in this possibility, with this kind of military leadership, China already lost a war without a single shot fired by either side. Once again, the US thanks China a bunch.