Resonance Cascade Event (RCE)

Transdimensional effect.

"I never thought I'd see a Resonance Cascade, let alone create one..."
― anonymous Black Mesa scientist

The Resonance Cascade is a cataclysmic and uncontrolled quantum event causing a rift or shift in the interface between parallel realities or possibly dimensions or possible bubble universe.

There have reportedly been a number of these in the last 20 years, and they usually result in considerable damage and even loss of life.
However these events have been the source of empirical proof of parallel universes / dimensions (such as Universe B) which are, allegedly, inhabited.

A Controlled Transdimensional Resonance (CTR) field is considered the 'holy grail' of transdimensional research but sadly RCE is too often the consequence of such research.