Don't forget they never searched in the south indian ocean until a few weeks after the plane went missing they spent a good 3 weeks or so looking in the china sea then the north Indian ocean. They missed the opportunity any debris would be scattered by the currents and impossiable to find only could do so by luck
Yes,the Indian ocean as a whole being the deepest in the world,though by now,any debris would have come to light. I imagine the poor passengers still strapped to their seats having to adopt the brace position if the pilot was ready to ditch the plane.
If the plane went down in one piece then there wouldn't be anything floating around especially from a sealed cabin.
Obviously the equipment being used doesn't go down the ocean far enough, plus there'll be no signal as the plane's battery function was already knackered. I can't visualise anything that would/will reach the bottom of the Indian ocean,so I don't know what they'll do next.
