Marine Civil Engineering

RS Divers has experience in a huge variety of civil engineering projects at sea and on land.

Our Services

We can undertake any marine civil engineering task as well as projects on marinas, inland waterways, lakes and reservoirs. RS Divers Ltd. can work as a main contractor or subcontractor, always with the highest standards of safety and professionalism.

Underwater metalwork and welding

Our expert-coded divers can tackle cutting and welding jobs of any size. We have specialist equipment such as BROCO and the PVL Gas Cutting Torch, as well as standard welding gear, to make sure no job is out of reach.

Lock Gate Maintenance

RS Divers has been providing lock gate support for marinas and waterways for more than ten years. All our staff divers understand the complexities and dangers of locks and weirs and can always find the best way to carry out the task in the safest way possible.

Dredging Support

We are experienced both in using airlifts in small dredging operations and in providing dive support to larger operations. RS Divers Ltd. can provide debris clearance, Explosive Ordnance Disposal (EOD) support and propeller clearance for large dredgers.

Scour Protection

Our divers have extensive experience in protecting bridges and other structures from the scouring effects of the sea and rivers. We use rock armour and Proserve and Enviroform concrete mattresses.

Buoy and Mooring Maintenance

RS Divers inspects and maintains more than 500 moorings and buoys every year for clients along the south coast of England, making sure they are in good condition and safe to use.

Cathodic Protection

We can help boatowners and marine companies control corrosion with various kinds of cathodic protection. Our experienced staff divers can weld anodes underwater, saving time and money in dry dock. We are also accredited SeaShield 2000FD applicators.

Underwater Demolition

We use Cardox CO2 and other specialist tools to carry out effective and efficient demolition jobs in complete safety. Our staff divers are trained in all the necessary technology to complete the task.

Non-destructive Testing (NDT) in difficult environments

We can provide divers with CSWIP 3.1 and 3.2 certifications to carry out surveys and scour surveys from ultrasonic thickness to cathodic protection in all locations, including bridges, jetties and piers.

We have fully trained teams who can work in confined spaces such as tanks, culverts, tunnels, sewage tanks and outfalls. We have access to the latest underwater Remote Operated Vehicles (ROVs) that can operate within small pipelines and outfalls too small for a diver to enter.

Dock Wall Repair

Our experienced divers provide expert dock wall repairs and maintenance services to all kinds of organisations on our native south coast, throughout the UK, and beyond. 

Utilising the latest technologies, our team can identify any damage caused by corrosion or wear. Following a thorough inspection, they can repair and seal cracks, fill voids with concrete, strengthen walls with anchors and grouts, and provide other necessary repairs to keep your dock structures safe from erosive forces. 

Our Marine Civil Engineering work

Our recent work includes:

  1. Cutting out old piles with Broco in Portsmouth Harbour.
  2. Identifying pUXO and removing non-UXO targets in a major shipping lane prior to dredging.
  3. Building an underwater frame in the open swimming ponds on Hampstead Heath.
  4. Welding plates over existing sheet piles to extend life in Portsmouth Harbour.
  5. Dredging under a floating yacht club in Brighton Marina to protect structural integrity.
  6. Inspecting a water tower in a reservoir in Kent to assess marine growth and impact on efficiency and effectiveness (there were multiple corals and fresh-water mussels restricting water flow).
  7. Plugging leaking pipes in a water tank outside Glasgow to allow repair works. 

Contact RS Divers about your next Marine Civil Engineering project

With decades of experience in civil engineering both on land and at sea, RS Divers is eminently qualified to undertake your next civil engineering project. To talk to our Operations Team, please call, email or fill out our contact form, and we will be in touch.


How do you pour concrete underwater?

Powerful pumps are used to transport the concrete mix to the site, and the flow is directed from above ground through watertight pipes known as tremies. Our divers ensure that the right amount of pressure is maintained during the process while making sure that no air pockets are created in the mix. 

What type of concrete is used underwater?

Underwater concrete is specially formulated for its strength, durability, and permeability. There are different types available, but they all have similar properties to facilitate rapid setting and avoid tidal washout.

Does fractured concrete need to be replaced or repaired underwater?

We would never answer this question without a thorough site survey. It depends on the severity of the cracks, the percentage of the structure it affects, how old the structure is, where it’s located, and many other variables. After an inspection, you can rely on our professional recommendations on the best way to prolong the life of the structure for years to come.

What is the maximum depth for underwater welding?

66 metres. It is important to note that this limit can differ depending on which region you are working in, as well as the type of equipment being used. As such, it is important to consult with a professional diver to ensure the job meets all safety standards and regulations.

What is ‘scouring’?

Concrete installations in tidal and river waters suffer from erosion, or ‘scour’, over time which compromises structural integrity. Scour protection involves adding concrete blocks, rock armour and other protective materials around the structure to serve as a buffer, reducing its vulnerability to scour. 

Here’s Some Evidence Of Our Diving Expertise

Our case studies demonstrate the wide range of our work, the quality of our service, the fantastic results we achieve and the wonderful feedback we receive from our clients past and present.