Hi,
Seem's it's becoming a jump game ...
Maybe the boxes will never be recovered .. and only speculations supported by the BEA in a final report will add nothing to learn about this crash for any improvement (s) of flying safety.
At least a lesson is learned ... ?
The black boxes are designed only for be recovered from a ground crash or a crash in shallow water ...
For deepest water (the majority of the seas overflyed ) it's to be lucky.
Lucky is not a word (normally) used in the aviation world
So this design is a flaw and must be corrected ASAP.
If action is taken .. this crash will not be useless.