Underwater engineering

Diving work on and under water

UWT No.1 LLC is a diving company doing diving work for the oil and gas industry, ports and shipping companies across Ukraine. We service ships, build and inspect hydraulic structures and work on pipelines.

Diving services

From hull inspection to raising sunken vessels

All services

Ship servicing

Cavitation hull cleaning at 200–250 bar, propeller polishing, thickness gauging, underwater hull repair.

Marine salvage

Raising sunken vessels, equipment and structures with pontoons, blowing and pulling gear.

Construction and repair of hydraulic structures

Diving support for sheet pile and pile installation, cathodic protection replacement, concrete repair.

Inspection of hydraulic structures

To classification society requirements. Photo and video records, depth soundings, charts and reports.

Pipelines and cable routes

Laying, spool piece and flange installation, repair clamps, underwater welding and cutting.

Dismantling of structures and sunken objects

Diamond wire cutting, soil removal by ejector and AirLift, lifting with pontoons.

About the company

We keep our word

Careful planning, sound management and professional execution. That is how we keep our commitments to clients, employees and society.

Health and safety

Oil and gasPortsShipping

Under water

The client watches the inspection live

Inspections are filmed on digital video and streamed to the surface by ON-LINE TV. Reports are prepared under the supervision of classification societies.

ON-LINE TVlive feed to the surface

200–250 barcavitation hull cleaning

5–30 mmunderwater shell plate welding

From our sites

Frames from work footage

This is how our divers see harbour water. More photos and videos on the service pages.

To services

Diver inspecting a structure with a torch — Structure survey

Diver filming on the seabed — Video survey

We are hiring divers and ship assemblers

With experience or without. Apprentices are trained from scratch.

Vacancies

Questions and answers

What clients ask before ordering

Did not find your question? Tell us about the site and we will answer.

Ask a question

Can the hull be cleaned without dry-docking?

Yes. We clean the hull afloat by hand, by machine or by contactless cavitation at 200–250 bar. Sea chest gratings and box coolers are cleaned the same way, and divers polish propellers of any design and diameter.

Do you repair the hull afloat?

Yes. We weld shell plating 5 to 30 mm thick, fit bolted and box patches, and install cofferdams to replace shell sections. We seal stern tubes and openings, and replace seals, fittings and sensors on the water.

How do you raise sunken vessels?

By blowing and pumping out water, adding buoyancy with rigid and soft pontoons and lift bags, or by pulling gear: cranes, winches, tackles. Large objects are cut into sections with a diamond wire saw and underwater metal cutting.

What depths do you work at?

Soil down to 10 m is removed by ejectors, deeper we use an AirLift. Dives below 12 m are supervised by a certified diving physiologist, and the company has its own decompression chambers rated from 1 MPa.

How does the client supervise an inspection?

The inspection is filmed on digital video and streamed to the surface by ON‑LINE TV, with a classification society surveyor if needed. Afterwards we hand over photos and videos of the damage, depth charts, the positions of damaged areas and foreign objects, and profiles along the pickets.

Which documents confirm the company’s qualification?

The quality management system is ISO 9001:2015, certified by Bureau Veritas. High-risk work is carried out under a Declaration of Conformity registered with the State Labour Service, and pressure equipment runs under its permits. Copies are on the Certificates and permits page.

How much do diving services cost?

The cost depends on the site and the scope of work. Call us or leave a request, tell us about the job, and we will propose a solution and an estimate.

Diving and underwater engineering across Ukraine

UWT No.1 LLC is a diving company. We do diving work for the oil and gas industry, ports and shipping companies, from a ship survey to underwater engineering on hydraulic structures and pipelines. The quality management system is ISO 9001:2015, certified by Bureau Veritas, and high-risk work is done under a declaration registered with the State Labour Service. Several diving teams let us work on different sites at once.

Ship servicing afloat

We inspect the underwater hull on digital video streamed by ON‑LINE TV, with a classification society surveyor if needed. We clean the hull by hand, by machine and by cavitation at 200–250 bar, polish propellers and carry out ultrasonic thickness gauging with defect reports. We repair the hull without dry-docking: weld plating 5–30 mm, fit patches and cofferdams, seal stern tubes, replace anodes. We measure propeller shaft sag and rudder stock bearing wear, and assist with docking a ship on keel blocks.

Construction and inspection of hydraulic structures

Divers assist with installing sheet piles, tubular piles, beams and blocks and placing tetrapods, remove soil and level the bedding. We replace cathodic protection, repair reinforced concrete of any complexity and measure the remaining thickness of sheet pile walls. Structures are inspected to classification society requirements, with depth charts, positions of damage and foreign objects, and profiles along the pickets.

Marine salvage and dismantling

We raise sunken vessels, equipment and structures by blowing, pontoons, lift bags and pulling gear. Soil down to 10 m is removed by ejectors, deeper we use an AirLift. Objects are cut with an 80 kW diamond wire saw, by arc, oxy-arc, exothermic and gas cutting, and debris and man-made waste are cleared.

Pipelines and cable routes

We survey crossing routes, lay pipelines and cables, install weights and rock berm protection. We fit spool pieces, assemble flanged joints of any diameter, install repair clamps and carry out every kind of underwater welding and cutting.

Diving safety

Dives below 12 m are supervised by a certified diving physiologist, and the company has its own decompression chambers rated from 1 MPa. Cylinders are filled by our own compressors operated under a State Labour Service permit. Divers pass a medical examination and health and safety training every year.