By PM someone has asked me the following:-
How will they find either the DFDR or CVR if they were torn from their mounts at impact?
My simplistic answer, without knowing the exact distribution of the debris field, is locate the engines and compare the relationship to them of other parts of the aircraft, which will then provide an approximate heading at impact. Backtrack about 30 meters and start looking, or if unsure of the heading at impact, just start searching outward from the engines. If they are buried in the sand, magnetic anomaly detection could be used, or the treasure seekers inductive loop technique if using an ROV. The cable-laying vessel to be used in the Phase 5 operation - L'Īle de Sein, will have all the necessary equipment, as dead cable detection is its "bread and butter" job.