Updated October 2026
Defence & Security · Analyst SupportCommunication analysis for structured assessment contexts
EchoDepth for structured assessments is a human analyst support tool from Cavefish that produces structured, auditable records of communication patterns during interviews and assessments, for government-authorised operators. It is not an autonomous system. Every deployment requires a signed Data Processing Agreement and a lawful authority basis from the deploying organisation.
Government and defence operators only. EchoDepth is not available for commercial security deployments without an established lawful authority basis. Enquiries are assessed individually. A classified technical briefing is available to qualifying organisations.
Operator assessment is inconsistent, fatigues over time, and cannot be audited.
Assessment during structured interviews depends on individual operator observation - which varies by training level, fatigue, and experience. There is no consistent, auditable record of communication patterns observed.
FACS-based communication analysis is a validated, citable academic methodology - providing structured records that support operator training and calibration.
Communication analysis produced by EchoDepth is timestamped, structured, and reproducible. It supports - it does not replace - operator judgement and due process.
Generate a structured, timestamped AU analysis record during security interviews. Provides a documented behavioural signal to support officer assessment - not to replace it.
Compare human analyst assessments against EchoDepth signal data to identify calibration gaps and improve consistency of behavioural assessment standards across teams.
Review recorded interview footage with FACS annotation to identify behavioural signals that may not have been apparent in real time. Supports debrief and case documentation.
Governance framework
Every security deployment is individually scoped and governed. No off-the-shelf access.
Deploying organisation must provide documented lawful authority basis for the specific use case before deployment begins.
A bespoke Data Protection Impact Assessment is completed for every deployment, addressing the specific context, data subjects, and processing operations.
A UK GDPR Article 28-compliant Data Processing Agreement is executed before any data is processed.
EchoDepth outputs are advisory only. No deployment may use EchoDepth outputs as the sole basis for any decision affecting an individual.
Processing in public security contexts operates under substantial public interest conditions (DPA 2018 Schedule 1) - not consent or legitimate interests.
Full timestamped audit log of all processing, outputs, and human review decisions. Available for regulatory inspection.
Questions
What is the legal basis for EchoDepth in security environments?
Deployments operate under Article 9(2)(g) UK GDPR - substantial public interest - and applicable DPA 2018 Schedule 1 conditions for law enforcement and national security functions. All deployments require a completed deployment-specific DPIA, a lawful authority basis from the deploying organisation, and a signed Data Processing Agreement. EchoDepth is engaged only by government-authorised operators with an established legal gateway for the specific use case.
Is this an autonomous screening or decision-making system?
No. EchoDepth is a human analyst support tool. It generates a structured, timestamped record of behavioural signals during an interaction - it does not make decisions, assign risk classifications, or produce outcome recommendations. All determinations remain with qualified human officers. Solely automated decisions with legal or similarly significant effects are restricted under Article 22 UK GDPR. EchoDepth outputs are designed as decision support for a human reviewer.
What does EchoDepth measure?
EchoDepth measures observable communication patterns using the FACS standard - 44 facial Action Units that provide structured, timestamped records. The system provides objective measurement to support human interpretation and operator calibration.
What governance documentation is provided?
Every deployment receives: a deployment-specific DPIA, a signed UK GDPR Article 28-compliant DPA, a lawful basis assessment for the specific use case, technical architecture documentation, operator training materials, and full audit trail capabilities. Documentation is available for regulatory inspection on request.
How can security interview assessments be made consistent and auditable?
EchoDepth adds a structured, timestamped record of observed communication patterns to security interviews, so assessment does not rest only on individual operator observation. Operator assessment varies by training level, fatigue and experience, and without a consistent record it cannot be audited. The record uses 44 FACS action units, a validated, citable academic methodology, and it supports security interviews, analyst calibration and post-interview review. Communication analysis produced by EchoDepth is timestamped, structured and reproducible, giving operators a record that can be reviewed rather than a single observer's impression. It supports operator training and calibration, and it supports operator judgement and due process rather than replacing them. Outputs are advisory only: every determination stays with a qualified human officer. EchoDepth for structured assessments is a human analyst support tool from Cavefish, available to government and defence operators only, under a signed Data Processing Agreement and a lawful authority basis. Each security deployment is individually scoped and governed.
Request a classified technical briefing
Available to government-authorised security operators only. Enquiries are assessed individually. Include your organisation, role, and deployment context.
Request Briefing