...involving a microscopic man-made supernova/exploding star...any one know what I'm referring to?

I just need the name of the program. It was practically a really tiny hydrogen bomb or something similar caught on high speed film that looked just spectacular but I CANNOT remember the program name for the life of me. Probably along the lines of BBC or PBS nova programs. It's bugging the hell out of me and just on the tip of my tongue.

I found it on the internet a few years back so maybe some of you hardcore youtubers may have come across something similar.

Thanks in advance.