Thanks for that snippet of info Onetrack.
Am somewhat bemused by the JACC statement that the revised underwater search zone could be up to 700km (378NM) long. How can this tally with the CVR/FDR transponder pings picked up by the towed array and their reportedly short range? It either puts the provenance of these detections in doubt or implies they are being advised by experts that these high frequency acoustic signals can be channeled over greater distances.