It was most likely a German contractor. The law, as I remember some 20 years ago, was in order to perform explosives work in Germany, you must speak and understand the language. I looked at shooting some cooling towers for a US contractor doing work there.

Was a nice shot.

Here is what the video description states: Breakup of the Goliath of multistoried building in Marl to 13.08.2006 Video shows the breakup in real time and 3x in different Slowmo.

I have sent him an e-mail, so maybe we will here something back.