I find it amazing that they are still unable to locate the wreck.
Maybe because there is no "wreck", just a million small pieces of debris scattered over the ocean bed...
Look at the ROW debris field on the runway. At 500 mph the water surface is not significantly softer than a concrete runway.
Unless the aircraft already broke apart in the air (which slows down the pieces, no longer having an aerodynamic shape), we cannot expect many large pieces of wreckage left.
Which means the investigators will be mainly left with the CVR/FDR data and not too much "hardware" which still tells a story.