This was broadcast last week, I watched it today on iPlayer.

Interesting story behind what was named stuxnet. It was designed to seek out a particular series of Siemens PLC which were connected to banks of gas centrifuges in Iran. The centrifuges were forced to increase in speed and then slow to a near stop. They said in the documentary that this was to run the centrifuges at a resonant frequency, I'd already guessed their attack was to run the centrifuges through a range of mode shapes to destroy them.

It showed a couple of revenge attacks too.

Very interesting.

http://www.bbc.co.uk/programmes/b08bcc18