Difficult question and even more so when you take a look at the Asse II desaster: https://en.wikipedia.org/wiki/Schacht_Asse_II https://en.wikipedia.org/wiki/Sc

Difficult question and even more so when you take a look at the Asse II desaster: https://en.wikipedia.org/wiki/Schacht_Asse_II https://en.wikipedia.org/wiki/Schacht_Asse_II