Commercial Diving Services

HSE-Registered Commercial Diving Contractor

MMP Marine & Inspection provides commercial diving for water companies, utilities and civil engineering contractors across the UK. We are an HSE-registered diving contractor and full members of the Association of Diving Contractors (ADC), so every dive is planned and carried out to industry best practice.

Our commercial diving teams work in fresh and contaminated water, including sewage, on reservoirs, rivers, docks, harbours and the inlet and outlet structures of power stations. Diving is often the quickest and safest way to inspect, repair or install equipment underwater without draining an asset or taking it out of service for long.

Our commercial diving services include:

  • Underwater inspection and detailed reporting with 3D modelling

  • Non-destructive testing (NDT)

  • Underwater repairs, concreting and welding

  • Thermic lance cutting and debris removal

  • Valve removal and replacement

  • Supply and installation of limpet dams and cofferdams

  • Primary and secondary isolation plate design, fabrication and installation

  • Sheet piling

  • Dock, river and harbour wall repairs

  • Scour protection installation

  • Lock gate removal, replacement and repair

See our divers at work in the valve replacement at 25m depth and secondary isolation plate case studies.

Why choose MMP as your commercial diving company

  • HSE-registered diving contractor and full ADC members

  • Certified to ISO 9001 and ISO 45001

  • Experienced in fresh, contaminated and sewage water

  • In-house fabrication for isolation plates and bespoke parts

  • Over 75 years of combined water industry experience

  • UK-wide coverage from our base in Epping, Essex

Person scuba diving underwater, holding onto a rope with bubbles rising above.
Three workers in safety gear conducting underwater maintenance or inspection on a water intake pipe at a waterway, with a body of water and trees in the background.
Two workers in safety gear, including helmets and gloves, working on a boat near the water. One is kneeling in the water, and the other is standing on the boat, handling ropes and equipment. Ships and a distant building are visible in the background.
A person in safety gear jumping off a boat into a body of water, with a person in safety clothing nearby. The image has a black-and-white background with the individual in jumpsuit and the supporting person in color.

Underwater Construction and In-House Fabrication

Our in-house fabrication department designs and builds bespoke components, including isolation plates, flange plates, pipe pullers, mesh flooring and hand railing. Because design, fabrication and installation sit with one team, we can support complex construction and maintenance work both underground and underwater.

Our marine construction work includes:

  • Commercial diving in sewage and contaminated water

  • Work at nuclear and electric power stations, including inlet and outlet structures

  • Rock armouring and scour protection

  • Seabed clearance, debris removal and levelling

  • Custom in-house design and fabrication

  • Reservoir modification, repair and maintenance

For an example, see our porta dam isolation case study.

A large, heavy metal manhole cover with a central bar, located in an underground sewer or tunnel, surrounded by concrete walls.
A 3D model of a mechanical or electronic component, featuring a round orange base with green and yellow structural parts and green screw indicators, set against a dark background.
Construction site with wooden frame and black plastic liner for a pond or water feature, surrounded by brick and concrete edging.
3D model of a scientific or engineering device with a circular yellow component, blue support structures, and green, red, and yellow pivot points, set against a gray background.

Safety Boat and Pontoon Hire

We work on reservoirs, rivers and coastal outfalls every day, and our safety boat operators bring that experience to every job on the water.

We provide short and long-term safety boat hire. Each boat comes with a skilled operator, VHF radio, fuel and a boat trailer.

We also hire and assemble modular pontoons, supplied with mooring ropes, anchors, handrails, cleats and ladders.

A rescue worker in orange safety gear and another person in a life jacket and helmet in the water near a docked structure, with a boat in the foreground and a gray sky.
Black inflatable boat with a person wearing a blue helmet, floating on water near a pier with an overcast sky.

Reservoir Sonar Mapping and Dive Surveys

We offer several underwater survey methods, including reservoir sonar bed mapping, contouring, down scan sonar mapping and commercial dive surveys.

These surveys locate outfalls and inlets, raised pipework, submerged culverts, debris and silt mounds. Our sonar mapping works in live conditions with real-time data, and the images can be overlaid on digital mapping software to give accurate latitude and longitude. That makes it ideal for finding pipework before dive surveys, repairs or marker buoy placement.

Commercial Diving FAQs

What is commercial diving?

Commercial diving is diving carried out as paid work, such as inspecting, repairing or installing equipment underwater. In the UK it is regulated by the Health and Safety Executive (HSE) under the Diving at Work Regulations 1997.

Can your divers work in contaminated water?

Yes. Our teams dive in contaminated water, including sewage, as well as fresh water.

Where do you provide commercial diving services?

Across the UK. We are based in Epping, Essex, and work on reservoirs, rivers, docks and treatment works nationwide.

Do you also offer ROV inspection?

Yes. Where diving isn’t the safest option, our ROV inspection and pipeline inspection service surveys pipes and tunnels remotely.

How do I get a quote?

Call 01992 618055, email info@mmpmarine.co.uk or use our contact form.

Close-up of a waveform graph displayed on a screen, showing peaks and valleys consistent with audio or signal data.
A helicopter flying over a desert landscape with sand dunes.
Workers in orange safety gear and helmets on a floating platform with a small boat nearby, in a large body of water under a partly cloudy sky.

Testimonial 

“Working with the team from MMP was a pleasure from start to finish. Very professional and knowledgeable throughout the process from planning to execution. And standard of safety and workmanship on the day of install showed they were the right people for the job. Look forward to future works when MMPs expertise is needed again”

Mike Clegg Contracts Manager | Morrison Water Services
The image features the phrase 'CIVIL RIGHTS' with a red lion emblem in place of the letter 'L'.
Certification badge for ISO 45001 Health & Safety Management, issued by UKAS Management Systems, with a logo featuring a checkmark in a circle and a crown, and the serial number 8289.
Certification badge indicating ISO 9001 Quality Management, issued by UKAS Management Systems, with a logo featuring a crown and checkmark, alongside the logos of the British Assessment Bureau, featuring a stylized design in blue, red, and black.
Logo of the Association of Diving Contractors (ADC) featuring a stylized diving mask and the text 'ADC' and 'Association of Diving Contractors'.
The logo of HSE, featuring a stylized lion's face in maroon with black stripes.
Logo of The British Dam Society featuring a stylized dam illustration.