Sorry, stupid, but where did this big explosion come from?
YYY: Imagine you go into the elevator, and there smells of urine and a yellow spot on the floor – you and your neighbors will surely agree that someone was drowning in the elevator. But who did it, why, what he thought, you will hardly know.
The same fig with a big blast - a yellow spot and smell is there, and where it came from - no one knows.
And most importantly - it may be that the yellow spot from the oil, and the smell of nasopharynx (or any other quite possible option).
zzz: For the first time, I see a big explosion compared to a dirt in an elevator))