[UPDATE
the wreck sites of HMAS Sydney , and the Raider Kormoran have been located
the discovery raises more questions than it answers

hull largely intact .............. sitting upright
that demolishes my pet therory , namely that :
HMAS Sydney was destroyed by the belated detonation of an unexploded shell or torpedo fired by Kormoran , which ignited her own bunkers or powder
rooms
i honestly believed that Sydeneys fate had been similar to Hood`s - all be it delayed
i suspose the next logical theory would be sudden capsise - either caused by internal explosion / fire or mismanagement of counter flooding procedures
by the damage control teams
but how it hit the sea bed upright is another mystery