Don't these helicopters have an assigned altitude indicator that you set the MDA/DH at TOD and it barks at you when you reach that altitude, and don't they have a RADALT that you can bug that also barks at you when you arrive at the set height? I don't understand how you can descend below the minima without getting barked out, either by the instrumentation or by the NFP. And somebody must be looking outside when these things start barking at you to check if visual or not....do we know if the crew actually saw anything outside before impacting the water? Unless: I could sort-of understand if they inadvertently lost speed awareness just above the MDA and that caused things to go pear shaped very quickly with insufficient height/time to initiate recovery action.