I used to see the wreck of BA656 frequently as I flew into and out of Masirah between 1966 and 1971. The props used to come out of the water at low tide sometimes and once or twice the whole wreckage came to the surface during an exceptionally low tide.
Masirah ATC did an expedition at one low tide and came back with the control column which they had in the tower with some photographs of one of them sitting in what was left of the cockpit. It was in shallow water just off the old Catalina base at Umm Rasays.
I have attached an appallingly bad photograph taken on one of my trips.