Hyperbaric face inspection to assess ground conditions, identify obstructions (boulders, steel, utilities), and safely remove or break down obstructions blocking TBM advance.
Obstructions at the TBM face are among the most costly and time-critical events in tunnel construction. KCC's rapid response capability and multi-method obstruction removal expertise minimise programme delay and protect the TBM from damage.
Compressed Air Interventions (≤3.0 bar)
Standard compressed air (CA) entry into TBM excavation chambers for cutterhead inspection, cutter tool change, and face maintenance. Conducted under IMCA D 045, HSE L96, and ADCI Consensus Standards at pressures up to 3.0 bar.
High-Pressure Compressed Air — Heliox / Trimix
High-pressure interventions above 3.0 bar using heliox or trimix breathing mixtures to eliminate nitrogen narcosis and reduce DCI risk. Conducted under IMCA D 045 (High Pressure Compressed Air Supplement) and EDTC HPCA decompression tables.
Saturation Hyperbaric Interventions
Saturation-based hyperbaric interventions for extended TBM maintenance campaigns, eliminating repeated decompressions and DCI risk. Workers live at intervention pressure via a pressurised transfer shuttle (PTS) for multi-day campaigns.
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Hyperbaric Tunnelling
Specialist hyperbaric intervention services for TBM and bored tunnel projects operating under compre
View all Hyperbaric Tunnelling servicesIMCA · ADCI · HSE · HKCP Compliant
All diving operations conducted to IMCA, ADCI, HSE & HKCP standards
Our team is ready to discuss your project requirements and provide a detailed proposal.