EST. 1996


Underwater Construction......

Reservoir Cleaning

We clean reservoirs, any size, anywhere in Australia. Our specialty is the diver controlled vacuum method, but we also have cleaned reservoirs where they require pressure washing, or sweeping to the scour. We also ensure diving and non-diving is confined space compliant.

Our diver method is well proven over the years, with our companies first clean in Brisbane, Qld in 1996. We have since cleaned reservoirs in Queensland, New South Wales, ACT and Victoria. Our equipment is suitable for small water tanks, elevated water towers, large concrete storage tanks, and even larger lined potable water storage dams.

Our divers wear dry suits and full face masks while cleaning, to prevent contamination. Our equipment used in reservoirs is stored in our custom designed trailer and dedicated to reservoir use only. We also sterilise our equipment with sodium hypochloride solution.

Reservoir Inspections

Diving in reservoirs is something we do a lot. So if your reservoir requires an inspection for a condition assessment, leak detection, sediment levels, or safety we will be able to carry out an inspection you can be confident in. Our teams have carried out thousands of inspections.

Where video is required, we have a few options we use for our clients-
ROV Inspection
Diver Helmet Mounted Hard Wire Camera
Go Pro Digital Camera

Our reports include a condition assessment of the reservoir inside and out, above water and under water. Each item is ranked on a condition scale, which enables the viwer to carry out future planning, short term and longer term maintenance.

FRP Product Installation 

When designing reservoirs, FRP ladders and fittings are the best option. Galvanised products have long been the norm, but are not the best material to install, and will quite often have a very short lifespan insie a reservoir. . Stainless Steel can be better galvanised, but the best alternative is without any doubt FRP. “FRP” stands for Fiberglass Reinforced Polymer. FRP has perfect corrosion and chemical reistant properties, and is also much lighter than any metal alternatives.

By installing FRP products using our divers, the products will last much longer, and our divers will find them much easier to move around. underwater This will save on time and equipment required for the work.

We have installed FRP Ladders in many reservoirs, while they remain full, and on line. We have also installed FRP screens and FRP platforms in reservoirs underwater and above water. 

Confined Space Work

Our teams have Confined Space certification. We also have staff trained in Confined Space Gas Testing, Confined Space Supervision, and Confined Space Rescue, as well as Working at Heights. We inspect confined space areas regularly, and also offer our teams and equipment to companies such as SMEC, GHD, Cardno and Green Square Consulting to assist with their work, inspecting structures in confined spaces.

For work in reservoirs we have used boats and plastic barges, specifically chosen for reservoir work, and suitable for inspections and maintenance. By using boats, and our experienced staff, we can work in the area between the water and the roof, with minimal disruption to the operation of the tank. The risk of falling from height is removed, and it is far quicker than moving scaffolding around on the floor. Our plastic barge set up, allows repairs to be made on columns or pipework, also with minimal disruption to service.

Combine the above water inspection with our ROV, and you can achieve very professional inspections, with no impact to consumers.

Pipe Plugging and Plating

If any work is required with valves or pipework, traditionally the reservoir would be drained, and taken out of service. Using our dive teams, we install plates onto pipework and pipe penetrations for downstream valve and pipe work, or to enable cleaning of the reeservoir. We have a range of plates to suit a variety of sizes and fittings. When required, we can also fit inflatable test plugs to carry out the same work.

It is important when carrying out plugging, the plate or plug is properly secured. Inflatable plugs should not be the only means of protection for personnel working downstream. Our valve plates can be used in many situations, with no drilling or bolting. Once the water is released from downstream, the head of water above the plate, causes enough force to hold the plate in place. When it is time to remove the plate, we simply open our equalisation valve, and allow the water to equalise both sides of the plate, and the plate can be removed.

Leak Detection & Repairs

Reservoirs can develop leaks through floor joints, cracks in concrete, and fasteners for pipework. During our reservoir inspections, we have identified leaks and carried out repairs, while the tank remains on line and in operation. The divers swim over the floor and walls of the reservoir, and look for signs of potential leaks. This can be at areas where sediment is disturbed on the floor, cracks in concrete, or joints which show signs of separating from the outside material.

We simply inject a potable water safe dye, into the suspect area, and see if the dye shows signs of tracking into a leak. If the result is positive, the diver marks the position underwater, and maps the leak also.

Repairs can be made using under water epoxy. We have a range or products available to suit flexible and rigid applications. These repairs will show nearly immediate reults, with water stopped as soon as the epoxy is applied. We have also repaired lined dams in the floor and roof liner.

Contact Us

If you are looking for a dive team, who values safety, committed to good quality work, and up for a challenge, then contact us. 

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0411 472 763



38 Kendor Street, Arundel Queensland - Australia


PO Box 1665, Runaway Bay Queensland 4216 - Australia