Re: So what is going on?
Would a 777 crashing into the sea make a noise that could be recorded by submarine listening arrays like SOSUS? If so would the owner of the array consider it to be revealing too much information about their capabilities to mention it?
A good question to which you won't get a reliable answer!
Possibly, the owner of the array will just happen to discover floating debris and won't let on how they just happedned to know where to discover it. Arranging the cover story will take some days.
It would have been a loud bang compared to, say, a submariner dropping a spanner. So maybe they can inform the world through confidential diplomatic channels that "we are 99% certain it did not crash into the Indian ocean. Search on land. No, I cannot say any more". That, without revealing too much about their actual capabilities.