On the latest episode of befores & afters Scott Fisher, the special effects supervisor for Christopher Nolan's Oppenheimer. Fisher discussed the details of how they depicted the Trinity Test on screen, as well as his collaboration with VFX supervisor Andrew Jackson on many aspects of the film. 

https://podcasts.apple.com/us/podcast/oppenheimer-special-effects-supervisor-scott-fisher/id1637191010?i=1000644059629