Release the hounds ... uhh I mean the BlueFin.
So who is to say the Malaysians haven’t dropped some phony “black box” to give false pretense to their claim of the plane actually having gone down into the sea? Sending out artificial “pings”. (Tin hat theory, you bet). Batteries would run out and the box never would be found.
Can you imagine the size of that one “box” compared to the area they have designated as their target zone? Like looking for one particular grain of sand on a sandy beach some 500 miles in length.