False vacuum decay.

False vacuum decay is one of the most feared things in quantum mechanics. Another name for that thing is the dimensional collapse. The idea is that all particles involve false vacuums. The small false vacuum forms near superstrings that are the edge of the particle. The quantum low pressure in the particle keeps it in form. Or, the thing that keeps particles in their form is the interaction between the quantum field inside the particle and outside the particle. 

The outside quantum field pushes against the whisk-looking structure of the particle. A particle remains in its form as long as its inner structure is at a lower energy level than outside the particle. The thing that determines the particle's energy level is the elementary particle's shell. If the energy level in the particle rises too high, that rips its structure into pieces. If the energy level in a particle falls too low, that causes the particle's collapse. 

The dimension is energy level. The dimensional collapse can happen internally or externally. In internal collapse, the particle loses its internal energy. And that causes the particle to fall like a balloon that loses its internal pressure. In external collapse the outside energy level drops and that pulls energy out from the particle. 

When particles turn flat it leaves a hole behind it. Particles near that collapsed particle send an energy impulse that falls in the energy pothole, but that energy cannot reach the collapsed particle. And when energy, or wave movement comes from every direction that causes the formation of the energy bubble or dome. 

When outside energy tries to fill that hole that energy must come from somewhere. And that "somewhere" is other particles. That can cause a chain reaction where more and more particles start to lose their energy. The problem is that the wave movement slides over those flat parts but it cannot reach them. 

When lots of energy falls into the same spot from a large area. That can have a very strong impact. That packs lots of energy into one point, and sooner or later the energy load in that point turns so high that it pushes quantum waves backward. That can form a quantum tsunami that destroys lots of things. This explosion can be very strong. 

The other model is that dimension just removed from the people's eyes. The collapse of the energy level in particles causes a situation where the particle turns flat. And then other particles around it lose their energy to that particle. That means that the large particle group can lose its energy in a very short time. That means the particles around those particles turn flat. And that means those particles lose their ability to interact with other particles. Because energy travels always to lower energy points. A particle that falls can collect lots of energy from around it. 

https://www.vice.com/en/article/the-learnin-corner-false-vacuum-decay-0000052-v18n1/

https://en.wikipedia.org/wiki/False_vacuum