12 — Our expertise
Underwater works
Our underwater works in Quebec cover underwater construction and maintenance of submerged structures: underwater inspection, welding, concreting and cathodic protection, delivered by commercial diving crews.
Construction & Expertise PG provides specialized underwater work services across Quebec and Labrador. With more than 10 years of experience and equipment suited to subaquatic environments, our team works on port, industrial, municipal and civil infrastructure.
Our services include visual or video underwater inspection, analysis of submerged structures, ultrasonic thickness measurement and material sampling. These inspections make it possible to assess the condition of a structure, document damaged areas and plan the necessary repairs.
PG also performs underwater welding and oxy-cutting, coring, drilling, excavation, and the assembly or dismantling of structures. Our team can carry out underwater concreting, grout injection and the installation of cathodic protection systems to limit corrosion of submerged metal components.
Depending on project needs, our engineers can contribute to structural analysis, the preparation of plans and specifications, and the selection of intervention methods. This combination of engineering, inspection and specialized work allows PG to handle the project from the initial assessment through to the complete repair of the structure.
Services offered
Commercial diving and underwater construction services
With more than 10 years of experience in underwater work and state-of-the-art equipment, your submerged structures are in good hands.
- Cathodic protection installation
- Concreting and grout injection
- Structure assembly and dismantling
- Welding and oxy-cutting
- Excavation
- Core drilling and boring
- Structural analysis
- Visual and video underwater inspection
- Plans and specifications
- Material sampling and analysis
- Ultrasonic measurements
Why PG
- 24/7 emergency service across Quebec
- Eight regional offices for fast mobilization
- Multidisciplinary teams: mechanical, civil, electrical, underwater
- Rigorous health & safety culture and regulatory compliance
Our approach
A proven method applied to every mandate, from the first site visit to final deliverables.
- 01
Needs analysis
Site visit, surveys and understanding of operational, access and schedule constraints.
- 02
Planning and quote
Work method, resources, health & safety plan and a detailed estimate before any mobilization.
- 03
Supervised execution
Qualified crews, on-site supervision, daily progress tracking and management of contingencies.
- 04
Delivery and follow-up
Quality control, close-out documentation and post-intervention follow-up to your requirements.
Frequently asked questions
How is an underwater wharf inspection carried out?+
Visual and video survey of piles, sheet piling and riprap, thickness measurements, underwater core drilling when needed, then a structural analysis report prioritizing repairs.
Is underwater welding as strong as surface welding?+
Hyperbaric or habitat underwater welding meets project requirements; where loads demand it, we favour bolted assembly or a dry-habitat repair.
What does cathodic protection do for submerged structures?+
It slows corrosion of steel underwater structures using sacrificial anodes or impressed current, extending the life of wharves, pipelines and water intakes.
Do you perform underwater concreting?+
Yes. Tremie concreting, grout injection and caisson filling repair submerged structures without dewatering, in both fresh and salt water.
Regional coverage
Underwater works in Quebec, the Côte-Nord and Labrador
Our eight regional offices mobilize qualified crews close to your facilities.
Next step
A demanding project? Let’s talk.
Our team can support you from the initial assessment through to the full delivery of the work.