Regarding the search for the CSMU.
Under present circumstances where the ULB has been dislodged from the mounting brackets on the drum-shaped stainless steel enclosure of the small (100mm OD x 100mm ?) CSMU and the (bright orange w/ reflective tape markings) CSMU has been separated from the main housing of the CVR device, are the underwater dive teams restricted to visual/tactile search methods while scouring the sea bed?
Or does submersible technology exist that is capable of locating a stainless steel component (which may be made of an SS with properties that are not strongly responsive to magnetic field detection) at some depth below the surface of the sea bed amidst a debris field made up of aluminum and other metallic objects?