Hot-Zone Emergency is a Codex featured in Tom Clancy's Rainbow Six Extraction. It is unlocked by default.
Transcript[]

INDEX Analysis
Studies have shown that incursions of extended duration into Chimera-infested environment will activate a swarm event. (INSERT: Thermite - There's no standing up to that flood. You've got to know when to retreat.)
Environmental transition to swarm event cannot be interrupted. Operators must extract or exit the Sub-Zone. (Cross-ref: Extraction Protocol, Airlock Protocol)
Sub-Zone status is closely monitored. Buffer countdown to swarm transition will be communicated to operators with enough time to clear Sub-Zone.
Operators who cannot leave the area in time are considered missing in action. REACT Foam safety measures will be triggered. (Cross-ref: MIA Protocol)
EXTRAPOLATIONS:
Chimera reaction to extended incursion resembles acute biological response to harmful stimulus. (QUERY: inflammatory response) (INSERT: Doc - Interesting theory. We should investigate. Possibly a mediator chemical or signal triggers this reaction.)