The CVR recovery from AF447 has been mentioned a couple of times. It seems that its memory unit had remained in the shiny orange box. With the memory having gone AWOL
in the present case, it adds a different measure of difficulty to the search, offsetting the depth advantage somewhat. I have not noticed any published estimations of the chances
that the memory unit in its bare protective sleeve might get carried away by currents, in which case there is yet more added difficulty.