Oi Torres, yu longlong o wanem?
No way an Argosy could ever go into Wau. You are thinking of the Bristol Freighter. Same basic shape, and same dreadful pommie technology (or lack of it), and indeed a demonstrator did end up at the bottom of Wau airstrip (probably long since converted to a boi haus).
If an Argosy ever even tried to fly through that area the noise of 4 screaming Darts would have precipitated the greatest guria of all time, turning the highlands to prairies.