I agree, I'm sure if this was really a surprise then we would have never heard of it...You have to wonder whether the Chinese sub surfaced by accident, or were they trying to send a message.
And then you have to wonder, if they're prepared to show their hand with this, do they have anything else up their sleeve?
Kinda like when the US were denying the Stealth fighter, even though it had been flying for 10 years previously. Just imagine what the US have up their sleeves now.
Still, I'm surprised at this. I would have thought the NRO (national reconnosence office) would have detected it.
On the other hand, maybe the US are the ones who are keeping their capability a secret. It wouldnt surprise me in the slightest if the US did know they were there, and are just reacting this way to throw the Chinese off about exactly how sophisticated their technology is.
It just goes round and round...