Irish Sea Contractors' innovative spirit coupled with our depth of experience ensures that we always deliver high quality and safe projects on time and within budget, solving complex subsea challenges for our clients

Irish Sea Contractors is at the forefront of the industry, providing a wide range of services for our clients. Check out some of our recent projects to discover what we can do for you.

Subsea Cable Projects
Irish Sea Contractors _ Shore end civil
Power station shore end civils

Irish Sea Contractors delivered all shore-end civil works, including cable burial and protection, on seven power cable crossings (x3.5 km) on the River Shannon at Moneypoint Power Station. These power cables transmit all windfarm energy from Cork and Kerry into the grid at Moneypoint.

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Cable installation & burial of fibre optic cable

Irish Sea Contractors delivered on the installation and burial of a 4 km fibre optic cable to the Marine Institute's offshore test site, Smart Bay, which is located off the west coast of Ireland.

Cable installation & burial: UK - NL

In 2021, the Irish Sea Contractors team delivered all shallow water works on the installation of a telecom's submarine cable system between the UK and the Netherlands. Works included pre/post surveys, PLGR, cable lay, burial (1.5 m and 3 m ), mattress installation across cable route, and inspection and testing.  

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Cable installation: Portrane, Ireland & Southport UK

Irish Sea Contractors carried out cable installation and cable burial to 1.5 m depth including mattress protection where required in the Irish Sea. This included all shore-end civil works at both PLSE Portrane (8 km) and PLSE Southport (18 km). Irish Sea Contractors chartered mx Roxanne Z from Jifmar for this project.

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Cable installation & burial: Killala to New York

Irish Sea Contractors delivered all shore-end civil works at Killala which included cable burial in the seabed to a depth of 1 m to 1.5 m. We chartered the mv Granuaile from the Commissioners of Irish Lights for this project. Once completed, the Transatlantic Cable Ship continued laying the cable to America.

Arklow Bank Windfarm

Irish Sea Contractors completed multiple underwater works during the construction phase of the Arklow Bank Offshore Windfarm. The team carried out work on the seven turbines, work which included grouting works, inspections, and re-routing of export cables around archaeological sites.

Irish Sea Contractors Offshore Energy Se
Fabrication, supply & installation of
continuity cable brackets

Irish Sea Contractors completed the fabrication, supply and installation of 550 x continuity cable brackets. The brackets were installed on turbines using a work class ROV. This was the first time this specific engineering task was completed without putting divers in the water on this client's offshore windfarms. Our team perfected the methodology in our subsea innovation facility using a mock tower with strong tides prevailing until the task was mastered. Because of this, our team completed the project faster than expected.

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Servicing of drilling rig

Irish Sea Contractors provided 6G coded welders on board Ocean Rig's semi-submersible drilling rig, "Erik Raude". Due to the quality of the team, we were selected as the only supplier of fabricators for four years, until its retirement in 2016. Our team worked on the rig in Sierra Leone, Gambia, the Ivory Coast, South Africa, Ireland and Falkland Islands.

Offshore energy projects
Shipping & Port Projects
Port Maintenance

Irish Sea Contractors provides diving services and marine civil engineering to both Dublin Port Company and Rosslare Europort, and has done so for over 10 years. This work has included marine construction, quay wall works, subsea concrete works, and ship maintenance.

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Shipping services

MV Pantanal, a 7,000-tonne heavy lift vessel, suffered severe bottom damage to its hull after dragging anchor and going ashore off the west coast of Ireland. Irish Sea Contractors first completed a detailed hull survey to GL standard, and then carried out urgent temporary repairs to enable the vessel to sail to Bremerhaven for drydocking. Our 10-man diver welding team carried out extensive plating repairs to seven holes and cuts in the hull. After 50 hours of underwater welding, the vessel was completely sealed and set sail.

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Irish Sea Contractors completed the salvage contract for lift and refloat of mfv "Genna C" which has sunk 1.5 miles off Drogheda Harbour. The team used 5x 5 ton parachute bags and 2x 5 ton fully enclosed bags. The vessel was towed into Clogherhead Harbour with all lift bags inflated on a high tide. The vessel was then lifted onto the quay wall with a 100 ton crane.

Repair of Pontoons

The team completed repairs of two tern pontoons in Dublin Port. The pontoons were pushed in from out at anchor to Alexandra Basin and lifted out by crane which was challenging due to their size, weight and poor condition. New anodes, timber and stone were installed on the pontoons and the repairs were completed. The pontoons were returned to their location and the terns are expected to return to nest in the coming weeks. 

Our clients
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