JF Subtech provides extensive capability and solutions for a variety of marine project scopes.

Where operations necessitate niche or technically complex project scopes in harsh marine environments, JF Subtech is the trusted partner for critical expertise in safe, efficient, and effective delivery. We are fully equipped and experienced to support the needs of our customers, ensuring projects are completed safely, efficiently and cost-effectively. 

Our marine project services include: 


JF Subtech is a member of the International Marine Contractors Association (IMCA) and accredited by all of the major class societies. Our diving equipment and decompression chambers are portable and strategically placed in order to service customers rapidly and effectively.

Our diving capabilities include:

  • Air / nitrox diving
  • Nearshore construction support
  • Ships husbandry
  • Emergency response
  • Oil and gas
  • Saturation diving
  • ROV


JF Subtech South Africa offers a wide range of NDT and inspection services, with experience in special surveys and class renewal surveys. Our equipment is strategically placed throughout South Africa to service customers rapidly and effectively. 

Our NDT capabilities include: 

  • Ultrasonic thickness measurements 
    • Class renewal surveys 
    • Class special surveys 
    • Class intermediate surveys 
    • Autocad reporting 
    • Steel renewal calculations 
  • Anchor chain calibration  
  • Underwater inspections 
  • Propellor cleaning 
  • Magnetic particle inspection 
  • Liquid penetrant inspection  
  • Ultrasonic flaw detection 
  • Eddy current testing 
  • Visual inspections 
  • Radiographic testing 
  • Vacuum box testing 
  • Positive material identification 
  • IRATA rope access 
  • Closed-circuit television 
  • Confined space  

Emergency response

In an industry where time often means enormous financial consequence, JF Subtech takes pride in having the resources and experience to attend marine casualties promptly. 

A member of the International Salvage Union (ISU), JF Subtech has access to an extensive fleet and boasts an impressive resume of emergency response experience around the harsh coastline of Southern Africa, including:

  • LOFs 
  • Refloating of grounded vessels 
  • Pollution control 
  • Wreck demolition 
  • Towage of distressed vessels
James Fisher is a global supplier of trusted engineering services across the industries we serve, with an unrivalled ability to develop innovative solutions that meet the constantly developing needs of our customers operating in challenging environments.
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Expertise for the extremes

JF Subtech helps to deliver the world’s most complex, technically demanding, and environmentally challenging energy projects in construction, IRM and decommissioning.

James Fisher Subtech
Registered office: Fisher House, PO Box 4, Barrow-in-Furness, Cumbria, LA14 1HR, UK Registered in England No. 103667© 2024 James Fisher and Sons plc