-9,000m depth. Are the CVR and FDR rated for that depth? Even if they aren’t is it possible for them to withstand the pressure?
It’s more like 4500m deep, which is certainly very deep, but well within the depths that flight recorder are supposed to be able to survive (they are certified to at least 6000m). It is however pretty much the maximum depth that the ROV Australia has sent down there is certified to operate at, which could make things awkward.