i must say ` well done` to the french navy , especially the submarine crew - trying to find a needle in a haystack , using equipment `out of spec` , not properly knowing the water conditions beneath them - and thales trying to push the sonar even further shows a dedication to the misison - to get `something` shows for pretty good equipment.
and likely that know how will be used for further finetuning`
Not sure if your post is ironic or if I've missed something (probably) but for the record..... the successful search was done by Woods Hole Oceanographic Institute using Remus 6000 autonomous underwater vehicles.
This stage of recovery is on a French commercial ship and using Remora ROV(s) provided by (and I guess operated by) Phoenix International
The Sonar and black and white photos are from the Remus. The FDR chassis pictures in colour would be from the Remora.