According to the recorder's explanation.
The institute divided safety accidents into seven levels in total.
[Tier 1, Anomaly Class]
This referred to safety-related problems involving laboratory facilities or experimental subjects that did not yet truly constitute a threat. For example, an Evil Spirit might accidentally escape its restraints but would quickly be brought back under control by the safety protocols.
[Tier 2, Incident Class]
The facilities or experimental subjects in an experimental area would experience minor loss of control.
For example, an Evil Spirit being used for an experiment might escape its restraints and successfully leave the designated area. It might pose a danger to the staff, but the situation would soon be brought under control.
The so-called designated area.
For example, it might originally have been prepared for transport to the laboratory for research, but then it left the laboratory.
The laboratory was the designated area.
Leaving the laboratory meant leaving the designated area.
[Third Level, Severe Incident]
There was a risk that a supernatural phenomenon might spread through the experimental area.
However, the safety mechanisms would still be operating normally, and the security personnel could control or eliminate the dangerous threat or facility within a short time.
The so-called experimental area referred to a region composed of multiple laboratories and auxiliary institutions.
Each floor was divided into multiple experimental areas.
In the institute's history, safety accidents had only ever reached Tier 3, and even those cases could be counted on one hand.
Beginning with Tier 4, they were called "accidents."
Tier 4 was a minor accident. It meant that the danger had already spread beyond the experimental area, with a risk of permeating the entire floor. At this level, security support might be required to terminate the threat.
Tier 5 was a severe accident.
At this level,