In #227 DaveReidUK wrote: "Found a video of the recovered CVR chassis from yesterday, which confirms it's an L3 (originally Fairchild) FA2100." A video in the post reveals the state of the FDR and CVR components found at the time.
The FA2100 can be viewed at the L3Harris website. The cylindrical drum in the foreground is the stainless steel "Crash Survivable Memory Unit". The orange outer housing with the reflective tape forms the protective shell for the CSMU - this is what divers will be searching for.
If the outer housing of the drum is compromised or separated from the contents (refractory material for heat protection and circuit boards bearing the solid state memory chips), I imagine that prospects for data recovery may be hampered.