Underwater Construction

Commercial divers must be multi-faceted in their training, and are required to perform under extreme and inhospitable conditions.underwater construction

An integral skill for any commercial diver is to have a firm understanding of the principles of underwater construction and how this type of construction is utilized.

For instance, divers are often employed to weld on underwater structures - including pipelines, dams, bridge piers, and retaining walls - and the diver must be knowledgeable about the underwater construction techniques and tools which contribute to the creation and maintenance of these underwater structures.

Oftentimes, commercial divers will employ a variety of specialty tools such as underwater saws, torches, and welding rods, to repair and maintain a variety of underwater structures such as the ones listed above.

As with traditional construction done above water, safety is a top priority in marine construction. Divers must communicate closely with topside on the status of the task at hand so that both parties can operate efficiently and safely.

Underwater inspection is also a vital component to underwater construction. Divers must be able to survey the condition of existing structures and relay this information to topside. Divers are often outfitted with underwater cameras to provide valuable information which can be analyzed after the inspection has been completed. Remotely controlled submersible vessels may also be used to inspect structures when circumstances call for such measures to be taken.

Underwater construction is utilized by the US Navy, city and state governments, as well as private diving companies to carry out a variety of tasks pertaining to underwater infrastructure. Whether it be construction or repair, chances are commercial divers will be the ones to help carry out the task at hand.

Underwater construction and maintenance has become a necessity for many clients who cannot surface their ships or infrastructure for maintenance or repairs. It has required Franmarine to be innovative – to engineer new systems and underwater construction practices and accommodate the client’s needs.

Franmarine’s experience is vast, with projects requiring varied underwater construction services such as slipway maintenance and repair, jetty maintenance and repair, pipeline installation and maintenance, pile wrapping - Denso Seashield and underwater expoxy coating systems.

Underwater construction services:

In-water Surveys and Inspection

  • Jetty Piles
  • CCTV Video Inspection
  • Still Photography

Corrosion Inspection and Protection

  • Denso Seashield
  • Grit Blasting
  • Alocit Underwater Epoxy Paint

Subsea Welding

  • Temper Bead Wet Welding
  • Anode Replacement
  • Sea Walls
  • Subsea Cutting
Hydraulic Tools
  • Cutting
  • Drilling
  • Grinding
  • Chainsaw
  • Subsea Drilling, core samples
  • Pipeline Installation and Stabilisation


  • Demolition
  • Rapid Emergency Response
  • Jetty Maintenance
  • Environmental Impact Statements
  • Slipway Repair

Related projects:

  • BAE ship lift facility cathodic protection
  • Underwater epoxy coating paint system trial