I was in RSA in the early 80s. There were a lot of RSA ships doing research in the area at the time. As was the custom the issued commemorating envelopes with s

I was in RSA in the early 80s. There were a lot of RSA ships doing research in the area at the time. As was the custom the issued commemorating envelopes with special postmarks at the time https://www.picclickimg.com/d/l400/pict/323741168155_/Antarctica-RSA-South-Africa-cover-79-IV-24.jpg https://www.picclickimg.com/d/l400/pict/323741168155_/Antarc... they were all postmarked "Neutron Research". At the time the rumour was that they were developing "a neutron bomb". This and the red mercury incidentshttps://mg.co.za/article/1995-01-20-sadf-linked-to-red-mercury https://mg.co.za/article/1995-01-20-sadf-linked-to-red-mercu... left no doubt in my mind that the tests took place.