Bizbug:
At least if we had the aircraft it could be inspected by someone who knows what they are looking at or for and if the location was known and in twenty meters of water surely it could not be that difficult! Are the divers that were sent down familiar with the 52? Who knows what is behind that little panel on the left hand side near the tail
It would appear, following the ATSB decision NOT to retrieve the Westwinds flight data recorders, that it is now official ATSB policy to close investigations as quickly as possible on the flimsiest of excuses and blame the pilot.
Technical investigations may bring up conflicting facts that dont fit the ATSB script. That is why the wreck isn't retrieved.