Compressed-air works · TBM hyperbaric interventions

Stephane Dumas

Hyperbaric Operations Manager

25 years under pressure, from commercial diving to TBM cutterhead interventions. I plan, write and run hyperbaric works so that every worker who goes into the chamber walks out of it.

012 3456 BAR 5.80 deepest intervention, Ø17.6 m TBM
25+
years in high-pressure work
1,600+
hyperbaric interventions
5.80bar
maximum working pressure
0
incidents
What I do

From the method statement to the last decompression stop

Hyperbaric works in tunnelling are short, risky and unforgiving. I cover the whole chain: the paperwork the authority approves, the equipment that keeps people alive, and the team that runs it.

01

Hyperbaric works management

Hyperbaric Operations Supervisor (HOS) and manager on TBM and pipe-jacking drives.

  • Intervention planning and control
  • Manlock and medical lock operations
  • Hyperbaric team set-up
02

Procedures and method statements

Written for site use and for approval by the authorities.

  • Air, Nitrox, Trimix, saturation
  • Decompression and oxygen tables
  • Checklists for every station
03

Equipment and TBM systems

Assessment and optimisation of TBM hyperbaric systems, before and during production.

  • Manlock, medical lock
  • Breathing air and oxygen supply
  • Kirby Morgan and Divex technician
04

Training

Practical training on the real equipment, in the language of the crew.

  • Compressed air workers
  • Lock attendants
  • Emergency procedures
Career profile

A career drawn as a dive profile

Each plateau is a project, each depth its maximum working pressure. The surface intervals were spent on dewatering and site management for the same tunnels.

012 3456 bar 200120062011 201620212026 SATIF · TBM & TDM interventions · Lyon Metro D, MTR WIL 703 3.60 bar MTR SCL 11034.20 bar Tuen Mun – Chek Lap Kok5.80 bar · saturation CKR3.20 bar MTR 12012.30 bar Sha Tinup to 3.45 bar surface: dewatering · site management diving years (1992–2001) above this line
completed projectscurrent project (method statement limit)
Selected projects

Where the pressure was

2025 –Hong Kong

Relocation of Sha Tin Sewage Treatment Works to CavernsCurrent

Emergency bypass · pipe jacking · Hyperbaric Manager

Hyperbaric method statement for cutterhead maintenance, hyperbaric team, medical lock, breathing air and oxygen supply.

3.45bar, method statement
2025 – 26Hong Kong

MTR 1201 · Tung Chung West Station and Tunnel

Ø7.17 m TBM · Hyperbaric Operations Supervisor

50+ interventions with zero incidents. Assessment of the TBM hyperbaric system, method statements for Air and Nitrox.

2.30bar max
2020 – 21Hong Kong

Central Kowloon Route · Central Tunnel

Ø7.11 m TBM · Hyperbaric Operations Supervisor

60+ interventions with zero incidents. Method statements for Air and Trimix. Then site and dewatering manager on the same project.

3.20bar max
2014 – 18Hong Kong

Tuen Mun – Chek Lap Kok Link · subsea tunnel

Ø17.60 m TBM · Hyperbaric Operations Supervisor

World first: saturation interventions during TBM production. Trimix bounces and air interventions, 600+ interventions with zero incidents, manlock and medical lock operations.

5.80bar max
2013 – 14Hong Kong

MTR Shatin to Central Link 1103

Hyperbaric Services International · CEO and HOS

900+ interventions with zero incidents. Trained the compressed air workers and lock attendants.

4.20bar max
2001 – 13France · abroad

SATIF · submerged civil works

HOS, commercial diver, dive technician

TBM and TDM interventions on Lyon Metro Line D and MTR WIL 703. Dams, rivers, nuclear facilities. Diving systems on Cairo Metro Line 3 and the Yemen LNG project.

3.60bar max
Toolbox

Made for site use

Checklists and tables written for the crews, cutterhead tools and drawings adapted to each machine.

Checklists and tables

HOSManlockMan cageMedical lockOxygen supplyTBMPlantHealth checkDecompression tables

Cutterhead tools and drawings

Disc extraction netDisc measuring gaugeInspection boardAir supply schematicsOxygen network drawings
Qualifications

Certified where it matters

Hyperbaric

Compressed Air Worker, 4.8 bar 2015
Compressed Air Operation Supervisor 2014
Man Lock / Medical Lock Operator 2014
Recompression Chamber Operator 2012

Diving

Mixed Gas Closed Bell Diver 2015
Assistant Life Support Technician 2015
Class II, Category A (INPP) 1998
HSE Part 1 1998

Equipment

Kirby Morgan Technician 2010, 2013
Divex Technician 2010
Scubapro & Uwatec Technician 2009, 2013

Site safety · HK

Construction Industry Safety Training
Confined Space, Competent Person
First Aid
Contact

Planning hyperbaric works?

Tunnel, shaft or pipe-jacking drive, early stage or already under pressure: write to me.

stephane@hyperbaricworks.com
Based in Hong Kong · English · Français