What a cock-up! While being very funny on the face of things, is it not the case that the foam was generated using carbon dioxide? (expert, please!) If that were to be the case then the people trapped in the hangar, who had foam up to their chins at the very least, were in dire mortal danger surely. Indeed I hope that no poor sod WAS actually killed as a consequence of just following his orders to be there. So much for the prior risk assessment!