I have an inkling that this article will be very relevant to one of our regular Thread members/contributors
Clearly keen to demonstrate the versatility of the 'new' RAF Hercules, I suspect opportunities to support prestigious expeditions were welcomed by the Service (if not by the poor chaps then tasked !).
Here is an article written by W/C D le R Bird on the Cambridge University 'Staunings Expedition' of 1970.
If I'm not mistaken ... pic Page 166 ... that looks like one of those old Clement Clarke 'Wire' Headsets being worn down the back ... I bet that was a bit cold with the ramp down
Source Credit : MOD RAF Air Clues Feb 1971 (Pages 164 to 167)
Coff.