Established 1984

We're available 24/7/365.

Call us at 1-800-319-3556 

or 1-905-529-1344

Certified Underwater Diving Services Throughout Ontario

When you need a diver to perform an underwater job, Soderholm Maritime Services Inc is there to answer the call of duty. Available for projects throughout Ontario, our divers provide service 24 hours a day, seven days a week, 365 days a year and can be dispatched minutes after your initial phone call with us. As skilled, certified, and insured divers, we offer a comprehensive range of services, including:

Ship Inspections & Repairs

With rapid response times, we provide quality ship inspections and repairs for a diverse range of clients including shipping companies, agents and marine companies operating within the Great Lakes. Soderholm Maritime Services is recognized for in-water surveys by:

  • Lloyd’s Register of Shipping
  • Det Norske Veritas (G.L.)


We have also worked with:

  • Bureau Veritas (B.V.)
  • American Bureau of Shipping (A.B.S.)
  • RINA
Ship inspection

Our clients include all the domestic carriers working in the Great Lakes, all the local agents acting for foreign owners and some foreign agents and owners directly. We can travel to any location to meet the vessel. We have excellent working relations with the St. Lawrence Seaway Authority and all port authorities.


We have a very low turnover of personnel, and in conjunction with local ship owners, we conduct our own training program. This program consists of the use of our own training manual, visits to ships and shipyards and a tiered approach to working on ships. Because of this, you can be assured that the dive team that responds to your project is knowledgeable, experienced and professional. 


Typical jobs that our crew perform are:

  • Routine stern inspections as part of regular maintenance or suspected problems
  • Full hull surveys for: 
    • Extension to Drydock certificates
    • Pre-drydock surveys
    • Post grounding and damage inspections
  • Damage control -- working with ship repair companies or with the ship's crew to seal breaches or cracks in the hull or to remove/repair damaged equipment such as bilge keels, rudders or propeller blades
  • Salvaging of vessels and recovery of lost equipment

Water Intake & Outfalls

Our divers are available for routine or emergency service of municipal and industrial water intakes and outfalls. We can install underwater pipelines and facilitate cable laying as both marine and diving contractors. Whatever the case, we are experienced in all aspects of pipe laying and repair and can work with any type of pipe, including:

  • High-density Polyethylene (HDPE)
  • Ductile iron or steel with flanged or mechanical joints
  • Corrugated metal pipe (C.M.P.)
  • Concrete pipe with bell and spigot joints


Typical diving jobs include:

  • Trench inspection or removal of obstructions
  • Joining of pipe sections underwater
  • Installation or assembly of Intake or Outfall structures

Similar to new construction is the extension of existing pipelines, which typically involves the removal of the existing structure, the manual excavation of the end of the pipe and the installation of the new pipe and structures.

Underwater Search & Recovery

We are equipped to provide police and fire departments throughout Ontario with the recovery of vehicles, evidence and casualties. We are retained under standing orders and respond immediately when called.

Construction & Industrial Service

We provide underwater inspection and repair services for construction and industrial projects including, bridges, hydro-electric dams, water control structures, seawalls, wet wells and pipelines. Our divers are available for any type of construction or rehabilitation project.

zebra mussel colony

Zebra Mussel Control

Zebra mussels are an alien species of shellfish accidentally introduced into the Great Lakes in the ballast water of a foreign cargo vessel.

Soderholm Maritime supplies divers for the cleaning of underwater structures and for the installation of permanent or temporary zebra mussel control systems. We have installed many such systems throughout the Great Lakes and in smaller Ontario lakes. The most common system involves a chlorine diffuser installed in the intake, a feed pipe from the shore and may also include a water sampling line. This may be installed externally, similar to a new construction, or may be installed inside the pipe itself. We have worked on such systems since the early days of the zebra mussel invasion.

Underwater Cutting & Welding

We provide personnel and equipment for underwater cutting and certified underwater welding ("Class B": all positions), which adhere to Canadian Welding Bureau and American Welding Society standards.

Diving Inspections

Our personnel carry out diving inspections to determine and document existing conditions. We write our own reports and also work with consulting engineers. We inspect all manner of underwater structures and installations.

Contaminated & Potable Water Diving

Our divers have the knowledge and equipment to work in contaminated and potable water. We have worked in sanitary and industrial waste and our inventory of Kool Suits allow us to work in extremely hot environments.


Soderholm Maritime Services is on-call to meet your diving needs. Get in touch with us now to have our team dispatched to your location in Ontario!

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