On August 30, A Moderna Truck Crashed. Airspace was shutdown, Hazmat dispatched, DOD took over, and IIRC the public was not allowed near the incident.
But why shutdown the airspace and keep people away? Why was Hazmat necessary? The answer is most likely they didn't want people to see "something". And that "something" would be visible from airspace. And that "something" required hazmat suits.
Of course this is just a theory, but the piece that makes all this fit together is that they were gassing/fogging the area. Remember when they were wearing hazmat suits and fogging the streets in China at the beginning of the pandemic? This is too similar. If fogging fixes the problem, then they were killing something that was released by the vaccine. Virus? Bacteria? Parasites? I'm not sure.
Clearing the airspace would definitely stop the media from flying helicopters, and that could be something as innocent as people worrying the incident would be spun into something it's not.... or something much more nefarious. Secondly, I'm sure you wouldn't want to swim in a pool of the vaccine so there would be extra precautions taken for that. There's a lot of unexplained stuff that we've been lied to about... but Im trying to weight everything against logical explanations.