Slight thread drift... A French Oceanographic Research Vessel has 'mapped' the Yemeni Airbus crash site, and 'pinpointed' (their words) the recorders. They were at a depth unreachable by divers. Another French Research Vessel with an ROV was enroute to retrieve the boxes.
OK, so I do know that there is a 'search' for the boxes in the Atlantic, there were no details about the depths in the Indian Ocean that were 'mapped', but this gives some small hope, despite the enormity of the search area scale differences.