Tunnelling Ground, Atmosphere and Emergency Control (TUNN)
Underground ground support, ventilation, atmosphere, transport, services, water and emergency or refuge arrangements.
How to prepare for a CITB Specialist test
Lock in common site safety first, confirm the exact route with the card scheme, then add the relevant specialist hazards and competence boundaries.
Core concepts
Concept 1
Excavation and face support must follow the engineered sequence and respond to changing ground, water and settlement conditions.
Exam cue: Observe the face, support, lining and water conditions and report change immediately.
Concept 2
Ventilation and monitoring control dust, fumes, gases, oxygen deficiency and heat throughout underground work.
Exam cue: Respect transport routes, refuge arrangements, alarms and access controls.
Concept 3
Restricted access, underground transport and distance from the surface require reliable communication, fire control, evacuation and rescue planning.
Exam cue: Stop for ventilation failure, alarm, ground movement, inundation or loss of communication.
Risk pitfalls and guardrails
Moving ahead of installed support because the exposed ground appears stable.
Guardrail: Do not mix specialist routes or replace an engineered, competent control with a briefing, warning sign or PPE alone.
Switching off ventilation locally because of noise or cold.
Guardrail: Do not mix specialist routes or replace an engineered, competent control with a briefing, warning sign or PPE alone.
Blocking an emergency route with materials or parked plant.
Guardrail: Do not mix specialist routes or replace an engineered, competent control with a briefing, warning sign or PPE alone.
Memory anchors
Support Follows the Face
Maintain the engineered excavation-and-support sequence.
Air Must Keep Moving
Ventilation and monitoring protect against dust, fumes, gases, heat and oxygen loss.
Water Changes Ground
Report inflow, pressure, erosion and settlement signs quickly.
Transport Has Separation
Use controlled routes and communication around underground plant and rail systems.
Know Refuge and Exit
Understand alarms, escape, refuge and rescue arrangements before entry.
Failure Means Withdraw
Ventilation, ground, fire or communication failure triggers the emergency plan.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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