I’m not a conspiracy theorist but those data recorders would have been putting out the equivalent of a heavy rock-concerts worth of sound to any sub-surface military listening device. And that relatively compact debris site would have been a magnetic sea-bed anomaly the size of a skyscraper, even to a looking satellite. This one does make me scratch my head (and few other parts of my anatomy). I really believe the technology exists to have found this wreckage before now. Which must beg the question ‘why wasn’t it found until now’ ? and the answer to that can only be because it wasn’t convenient. For what reason we don’t know, will never know !