Likely someone smoking. Gotta learn alot on that first shift I guess.
‘Likely someone smoking’
That wouldn’t be the least bit surprising.
The little bit I've heard and description of these kids makes me doubt there were strict safety standards, if any at all.
No smoking anywhere on the property would be obvious to anyone.
But beyond that, in an explosives warehouse (which is what this is) eliminating electrostatic charges everywhere - on any fans or moving equipment, floors, packing materials, etc...is absolutely necessary.
On a dry day, a charge could be generated by something as simple as a metal cleat on someone's boot moving against some uninsulated floor or metal step.
Again, from the little bit reported on this, I doubt anyone considered such detail.
From first hand experience, I can say that Mexicans generally elide the rules, even safety rules. It's in their blood.