I think it's possible to overreact to the security issue here.
I base this opinion on the fact that my explosives experience is limited to pyrotechnic effects for the film and TV industry, yet on the exalted basis of my fifteen year old technology GCSE and access to a modest quantity of military explosives, I'd be pretty disappointed to do merely
this to a C-130.
OK, so the default approach here is caution, but this was done by people who have lots and lots of explosives experience and already know that what they did worked. I'm not sure we're really capable of hiding anything useful from them.
Phil