Suspected Chinese Spy Balloon

A suspected Chinese surveillance balloon was shot down in US airspace by military jets on Saturday amid allegations that it was being used for surveillance. China denied accusations of spying, saying it was monitoring the weather. What are spy balloons exactly, and what's the history behind them? Dennis B. Desmond, Lecturer, Cyberintelligence and Cybercrime Investigations, University of the Sunshine Coast joins Karyn on the show.