Hi Machinbird;
Re opening technique, perhaps - but the way AF447's were, by the photographic evidence supplied by the BEA anyway, so carefully and expertly opened, recognizing the extreme importance of what lay inside, would have one believe that the very same approach would be taken by those who actually did the work here. One hopes so, anyway. From the BEA photographs in AF447 Reports, the actual memory-module case appears to be very thick steel; they withstood the pressures that exist in over 3000/4000m of water. The primary difference here would be the very high 'g' loads that the recorders would have experienced at impact.
This said, the memory cases do appear to be unscathed and the actual modules inside likely survived unharmed. The absence of even the minutest updates concerning this phase of the investigation is disappointing, this being uncharacteristic of most investigative bodies, recent exceptions known and acknowledged, and does not serve the transparency necessary to alleviate the felt need for speculation in the absence of data. Like some here who have flown these aircraft, I think there is a felt-need to know as much as possible, as this does not "read" like a terrorist event.