Containment Integrity (CTI)
Physical containment health across the facility. A breach here is the BSL-4 Vault drill made real.
Formula
Thresholds & Bands
| Band | Range | State |
|---|---|---|
| Sealed | ≥ 99.9 | ok |
| Watch | 99-99.9 | warn |
| Breach | < 99 | crit |
Why This Metric Matters
Containment Integrity is the Directorate's primary physical-safety metric — a continuous composite that reflects the real-time status of every seal, pressure differential, and biocontainment envelope across all BCL-rated cells in the facility. The metric exists because the consequences of containment failure are categorically different from the consequences of any other operational degradation: a breach in a BCL-4 cell does not merely disrupt operations — it risks uncontrolled release of engineered biological agents with population-level impact. CTI is monitored with zero tolerance for ambiguity, and any deviation below the "Sealed" threshold triggers automated lockdown protocols before human review can even begin.
Threshold Justification
The 99.9% "Sealed" threshold reflects the requirement that effectively all containment barriers are simultaneously intact and verified. At this level, the only permitted exceptions are cells undergoing scheduled maintenance with decontamination-verified isolation from the active containment network. Below 99%, the facility's containment model can no longer guarantee that a single-point seal failure in one cell is isolated from adjacent cells — the "Breach" threshold at which the automated containment-lockdown cascade activates, sealing all BCL-3 and BCL-4 zones and halting all personnel movement until Engineering certifies restoration.
Historical Context
CTI has been monitored continuously since the BCL-4 vault and associated containment infrastructure were commissioned in Q4 2024. The metric has remained above 99.95% for the entirety of its operational history, with minor fluctuations attributable to planned maintenance windows during which individual cells are temporarily depressurized under controlled conditions. The single most significant incident was a pressure-differential anomaly in Cell 7 in Q2 2025, which triggered a precautionary lockdown lasting 4 hours before Engineering confirmed the cause was a faulty pressure transducer rather than an actual seal compromise.
Collection Method
CTI is computed continuously by the Facilities VITALNET subsystem, which aggregates real-time data from three sensor classes across every BCL-rated cell: door-seal magnetic-contact sensors confirming physical closure, differential-pressure transducers verifying that negative-pressure gradients are maintained at specification, and biocontainment-envelope integrity monitors that detect air-handling anomalies indicative of filter bypass or ductwork breach. Each sensor reading is weighted by the BCL rating of its cell (BCL-4 sensors carry higher weight than BCL-2) and combined into the composite percentage published to the Synaptic Data Fabric every 10 seconds.
Known Failure Modes
The primary risk is sensor-level false assurance: a pressure transducer that has drifted out of calibration may report nominal differential pressure while the actual pressure gradient is degraded, allowing CTI to display 100% while a real containment weakness exists. Conversely, transient sensor noise — particularly from magnetic-contact sensors on frequently cycled airlock doors — can generate momentary false-breach signals that trigger unnecessary lockdown cascades. The composite weighting model can also mask a critical failure in a single BCL-4 cell if the remaining cells are all nominal, since the high-weight cell's degradation is diluted across the large number of lower-rated cells in the aggregate figure.