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Port Services & Marine Inspection

SGS is recognized as a market leader in underwater marine construction, with long-term port service contracts in place with some of the largest ports and harbors in the world. Our marine construction division is staffed by project managers who have spent decades in the field, in the, water, refining their skills and knowledge base.

Port Services

Subsea Global Solutions (SGS) offers support for a wide range of inland and offshore construction projects. Our dive teams utilize surface supplied air, and mixed gas breathing systems to work safely at in-water depths up to 300 feet.


SGS is recognized as a market leader in underwater marine construction, with long-term port service contracts in place with some of the largest ports and harbors in the world. Our marine construction division is staffed by project managers who have spent decades in the field, in the, water, refining their skills and knowledge base. We employ staff engineers who can support your project from initial design to final completion. SGS is proud to be one of the only professional underwater service companies capable of offering high quality, turnkey solutions for our client's most critical marine construction needs. Port services include:

  • Timber Pile Repair & Splicing
  • Concrete Pile Repair & Splicing
  • Steel Pile Repair & Splicing
  • Structural Rehabilitation
  • Underwater Form Building & Concrete/Grout Pumping
  • Cathodic Protection System Maintenance & Repair
  • Debris Removal & Recovery Services
  • Sheet Pile/Sea Wall Support & Repair
  • Water Jetting & High Pressure Cleaning Systems
  • Trash Recovery & Disposal

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SGS has an unparalleled technical capability to deliver turn-key solutions at a global scale.
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Marine Inspection

Our inspection services cover Non Destructive Testing in both the Ultrasonic and Magnetic Particle Inspection disciplines, with up to date equipment owned by SGS. Our services include:

  • Slope Surveys
  • Seabed Surveys
  • Corrosion Surveys
  • Quality Assurance Inspection
  • In Service Inspections
  • Job Progress
  • Planned Maintenance Inspection
  • Damage Investigation
  • Insurance Inspection
  • ROV Inspection Services

Case Studies

Hull Breach on Tanker

During cargo operations, a submerged pile pierced through the hull. SGS worked together with owner and class to develop repair plan that included the design and installation of an engineered cofferdam.

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Offshore Oil & Gas

A Blue-Chip oil & gas company incurred several defects and cracks in a critical attachment member of an FPSO’s hull – these defects required repair to allow continued operation.

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Skeg Ripped from Azipod

3 month out of dry dock, galvanic corrosion caused heavy cavitation/erosion damage on PORT and STBD side rudders.

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SGS Reseats Shifted Tailshaft Afloat and Executes a Stern Seal Repair

The client indicated that the tailshaft had shifted aft approximately 200 mm when the ship’s crew was doing maintenance on the shaft coupling. It resulted in the aft water seal losing contact with the liner, causing large amounts of water ingress into the stern tube.

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SGS Completes an Afloat Rudder Stock Seal Replacement

This complex underwater repair was completed to the client's satisfaction in 5 days in conjunction with various other repair works. SGS managed both the underwater and internal portions of this repair to ensure each phase was executed seamlessly.

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Underwater Propeller Blade Straightening – Cold Static Loading

SGS can restore your propeller blades as a permanent repair, to OEM design geometry by cold static loading with our underwater propeller blade press.

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Double Bow Thruster Removal by SGS

The benefits of removing a damaged bow thruster afloat are many. The customer was able to prevent further damage to the bearings and gears caused by the presence of seawater in the gear housing and the procedures allows the units to be overhauled prior to the vessels next dry-dock—or, they can be re-installed afloat by SGS, which would help to eliminate the need for additional tug cost.

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Afloat Bow Thruster Blade Seal Exchange by SGS

The project was executed with two SGS teams working around the clock. While the vessel trimming process was in motion, the team onboard the vessel began to drain the oil from the thruster while the dive team began removing the bow thruster tunnel gratings to gain full access to the bow thruster.

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Scrubber Overboard Spool Pipe Repairs with 5 Year Warranty

The installation of complete SOx scrubber systems is entirely possible without taking the vessel out of the water. SGS’s involvement is focused on precision cutting of the hull penetrations for the sea chest openings and overboard spool pipe installation below the waterline.

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SGS solves serious problems: Assisting a large, fully laden post-Panamax container vessel with steering issues

SGS solves serious problems: Assisting a large fully laden Post-Panamax container vessel with steering issues. SGS works with port authorities, class, and manufacturers to provide class-approved in-water float out removal, repair, and refit of a 110 mt rudder. Find out how our underwater inspection and survey services deliver practical, cost-effective solutions to a complex offshore problem. SGS works with port authorities, class, and manufacturers to provide class-approved in-water rudder float out removal, repair, and refit of a 110 mt rudder. Helping owners safely reduce their risk exposure and related costs that would include diversions, delays, and downtime.

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Galvanic Corrosion on Rudders

3 months out of dry dock, galvanic corrosion caused heavy cavitation/ erosion damage on PORT and STBD side rudders.

View full case study

ROV Inspection

Subsea Global Solutions is able to supply a range of remotely operated vehicles to meet the inspection demands of clients where water depth, bottom time and or hazardous situations mandate the use of non-manned intervention methods.

A number of these vehicles are small and lightweight and can generally be operated by two persons out of a small boat or from the land.

ROV operations are particularly well suited to deep or hazardous applications of an observational only nature.

ROV’s are also often used for:

  • Power stations
  • Remote weirs and dams
  • Potable water storage reservoir inspections
  • Internal pipeline inspection down to 500mm diameter
  • Diver support
  • Inspection beyond normal diving range
  • Initial site surveys down to depths of 150 meters
  • Cathodic potential surveys

The vehicles can be fitted with high resolution color cameras, acoustic navigation systems and manipulators for basic operations such as small object recovery, sample collection and basic rigging.

Ultrasonic Testing (UT)

SGS is able to offer a range of Ultrasonic testing services including thickness testing using both digital and "A scan" equipment along with full weld inspection using angle beam probes.

Mag Particle Inspection (MPI)

M.P.I can be provided for surface crack detection using dedicated equipment employing direct and indirect magnetization systems. Surface preparation of the test pieces is also part of the service and ranges from high pressure water blasted surfaces, abrasive grit blast or machined finishes. Personnel hold both national and international inspection qualifications with an extensive background in offshore and onshore surveys of structures and components.

General inspection tasks are supported by High Resolution Color Video equipment which utilizes the latest digital image enhancement technology.

Real time monitoring at the surface enables clients to observe the video and direct the works as required.

These images can then be stored to conventional USB drives or made available through electronic media directly to the client's office.

Still photography systems using digital underwater cameras provide a range of photographic presentations including photo-mosaics, overall wide angle, and macro photography. Detailed inspection reports and CAD drawings are provided.

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Port Services & Marine Inspection

Hull Cleaning

Port Services

Subsea Global Solutions (SGS) offers support for a wide range of inland and offshore construction projects. Our dive teams utilize surface supplied air, and mixed gas breathing systems to work safely at in-water depths up to 300 feet.


SGS is recognized as a market leader in underwater marine construction, with long-term port service contracts in place with some of the largest ports and harbors in the world. Our marine construction division is staffed by project managers who have spent decades in the field, in the, water, refining their skills and knowledge base. We employ staff engineers who can support your project from initial design to final completion. SGS is proud to be one of the only professional underwater service companies capable of offering high quality, turnkey solutions for our client's most critical marine construction needs. Port services include:

  • Timber Pile Repair & Splicing
  • Concrete Pile Repair & Splicing
  • Steel Pile Repair & Splicing
  • Structural Rehabilitation
  • Underwater Form Building & Concrete/Grout Pumping
  • Cathodic Protection System Maintenance & Repair
  • Debris Removal & Recovery Services
  • Sheet Pile/Sea Wall Support & Repair
  • Water Jetting & High Pressure Cleaning Systems
  • Trash Recovery & Disposal

Marine Inspection

Our inspection services cover Non Destructive Testing in both the Ultrasonic and Magnetic Particle Inspection disciplines, with up to date equipment owned by SGS. Our services include:

  • Slope Surveys
  • Seabed Surveys
  • Corrosion Surveys
  • Quality Assurance Inspection
  • In Service Inspections
  • Job Progress
  • Planned Maintenance Inspection
  • Damage Investigation
  • Insurance Inspection
  • ROV Inspection Services

ROV Inspection

Subsea Global Solutions is able to supply a range of remotely operated vehicles to meet the inspection demands of clients where water depth, bottom time and or hazardous situations mandate the use of non-manned intervention methods.

A number of these vehicles are small and lightweight and can generally be operated by two persons out of a small boat or from the land.

ROV operations are particularly well suited to deep or hazardous applications of an observational only nature.

ROV’s are also often used for:

  • Power stations
  • Remote weirs and dams
  • Potable water storage reservoir inspections
  • Internal pipeline inspection down to 500mm diameter
  • Diver support
  • Inspection beyond normal diving range
  • Initial site surveys down to depths of 150 meters
  • Cathodic potential surveys

The vehicles can be fitted with high resolution color cameras, acoustic navigation systems and manipulators for basic operations such as small object recovery, sample collection and basic rigging.

Ultrasonic Testing (UT)

SGS is able to offer a range of Ultrasonic testing services including thickness testing using both digital and "A scan" equipment along with full weld inspection using angle beam probes.

Mag Particle Inspection (MPI)

M.P.I can be provided for surface crack detection using dedicated equipment employing direct and indirect magnetization systems. Surface preparation of the test pieces is also part of the service and ranges from high pressure water blasted surfaces, abrasive grit blast or machined finishes. Personnel hold both national and international inspection qualifications with an extensive background in offshore and onshore surveys of structures and components.

General inspection tasks are supported by High Resolution Color Video equipment which utilizes the latest digital image enhancement technology.

Real time monitoring at the surface enables clients to observe the video and direct the works as required.

These images can then be stored to conventional USB drives or made available through electronic media directly to the client's office.

Still photography systems using digital underwater cameras provide a range of photographic presentations including photo-mosaics, overall wide angle, and macro photography. Detailed inspection reports and CAD drawings are provided.

CONTACT US NOW

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