Cable Trenching

Trenching expertise delivered by capable assets and teams

Solutions that include engineering support, project management and capable assets, all delivered by a proven team with an extensive track record.

Our high performance trenching systems enable us to undertake projects which require precise installation in challenging seabed environments. The Q1400 is able to perform jet trenching on subsea pipelines, cables and umbilicals in soils of up to 100KPA. Additionally we can also perform mechanical chain cutting in soils of up to 250KPA. The Q1000 has 1,000 horse power of total installed and variable jetting power, capable of trenching pipelines, umbilicals and cables to depths of 3 metres.

The Q1400 is extremely adaptable and can uniquely transfer from jetting to cutting modes whilst at sea without craneage, avoiding the need to return to port for system changes. It consists of a common trenching module and separate tracked jetting and mechanical cutting skids, with a customised launch and recovery system (LARS) approved by Lloyds Register, able to work up to sea state 6.

The Q1400 system is capable of free flying in jetting mode and operating in water depths of up to 3,000 metres. It has 1,475 available horsepower with two 400KW high-pressure pumps up to 15Bar and 2,000 cubic metres per hour. Two additional 150KW hydraulic pumps provide low-pressure water and hydraulics. The system also has the capability to deploy an additional backwash or eduction tool as well as a tool to create backfill in soft clays.


Rigid Pipelines – Jet trenching for rigid pipelines with diameters up to 900mm. Pipelines can be buried to depths up to 3 metres, providing protection from trawling and other risks. Rigid pipelines benefit from better stability as well as insulation.

Flexible pipelines – Jet trenching or cutting for flexible pipelines, providing protection from fishing and other risks. As with rigid pipelines, trenching provides improved stability and insulation.

Control Umbilicals – Jet trenching or cutting for control umbilicals, providing protection from fishing and other risks. A trenched umbilical is more stable on the seabed.

Subsea Cables – Jet trenching or cutting for various types of cables, providing protection from fishing and other risks. Trenching also provides cable stability, preventing movement on the seabed.

Key capabilities:

  • Capable assets delivering precision installation and trenching in harsh seas and challenging seabed conditions
  • Trenching of cables, rigid & flexible pipelines and umbilicals
  • Providing maximum protection of assets
  • Proven success in oil & gas projects including BP – ETAP and Corrib
  • Project support at all stages, from planning to final survey and as-built report
  • Proven engineering, project management and trenching delivery
  • Q1400 jetting mode max product diameter - 900mm, max trench depth – 3 metres
  • Q1400 cutting mode max product diameter - 250mm, max trench depth – 2 metres

Our Latest News:

Posted: 18/10/2019

RewewableUK Offshore Wind Cable Project Intelligence Report

Our Director of Power Cables, Andrew Lloyd, features as part of...

Posted: 30/09/2019

Global Offshore to support the installation of critically important infrastructure across the Pentland Firth

Global Offshore, a leading provider of cable installation, repair and trenching...

Posted: 15/07/2019

Global Marine Group to Ride 500km for corporate charities the JST and the Ninos Pag-Asa Orphanage

Next week, a team of 26 amateur and enthusiastic riders from...

Posted: 25/06/2019

Global Marine Group to Safeguard Ørsted’s UK Power Cables Under the Atlantic Cable Maintenance Agreement

Global Marine Group (GMG), supported by its business units Global Marine,...

Posted: 24/06/2019

Global Marine Group launches unrivalled Subsea Pre-lay Plough the PLP240

Global Marine Group (GMG), has worked in close collaboration with offshore technology...

Posted: 21/03/2019

Global Marine Group’s Global Offshore to use new plough technology at Vattenfall’s Danish Kriegers Flak site

Chelmsford, Thursday 21 March 2019. Global Marine Group’s Global Offshore division,...

Posted: 08/03/2019

Meet some of our inspirational ladies on International Women’s Day

In 2019, the focus of International Women’s Day is about balance....

Posted: 28/02/2019

Osbit to deliver next generation Subsea Plough to Global Marine Group

Osbit Limited, the offshore technology and engineering company, has secured a...

Posted: 29/01/2019

Rovco and Global Marine Group Enter Invested Partnership

Subsea technology company, Rovco has formed an invested partnership with Global...

Posted: 08/11/2018

Global Offshore successfully installs export cable at Kincardine Floating Offshore Wind Farm

Global Offshore, a leading provider of cable installation, repair and trenching...

Posted: 05/11/2018

Feature: RenewableUK array & export cables project intelligence report

Our Director of Power Cables, Andrew Lloyd, features as part of...

Posted: 15/10/2018

ASV Pioneer sails for her maiden project

A couple of weeks ago, the ASV Pioneer, part of our...

Posted: 24/09/2018

Global Offshore to provide fast-response cable repair to Vattenfall’s European portfolio

Global Offshore, a leading provider of cable installation, repair and trenching...

Posted: 20/09/2018

Global Offshore delivers back-to-back projects in the North Sea for major oil and gas customers

Global Offshore, a leading provider of trenching and power cable laying...

Posted: 01/08/2018

Global Marine Group handed RoSPA Order of Distinction (19 consecutive Golds) Award for health and safety practices

Global Marine Group has been issued a prestigious award in recognition...

Posted: 31/07/2018


Global Marine Systems Limited (GMSL) trading as the Global Marine Group...

Posted: 24/07/2018

Nurturing the next generation of engineers

For the last couple of weeks, Megan, an A level student...

Posted: 05/07/2018

Global Marine Group to Ride 350km for corporate charity, the Jubilee Sailing Trust

Next week, a team of amateur and enthusiastic riders from Global...

Posted: 04/07/2018

Celebrating the successes of our people

At the end of June we held our Annual Awards Evening...

Posted: 03/05/2018

CEO Today Magazine Announce Ian Douglas as a European Award Winner 2018

Ian Douglas Wins CEO Today Magazine European Awards CWind, part of...

Posted: 12/04/2018

Contract Awarded for Sub Sea Cable Replacement in Orkney Isles

Global Offshore is pleased to share Scottish & Southern Electricity Networks’ latest press...

Global Marine Group Shipowner of the year
Posted: 14/02/2018

Global Marine Group presented prestigious Shipowner of the Year Award by Offshore Support Journal

The Global Marine Group (GMG), a market leader in offshore engineering...

Global Marine Group: Global Offshore
Posted: 20/12/2017

Global Marine Group announces new business unit ‘Global Offshore’ to serve the oil & gas sector

The Global Marine Group (GMG), a market leader in offshore engineering...

Global Marine Group acquires Furgo trenching
Posted: 01/12/2017

Global Marine Group completes acquisition of Fugro’s trenching and cable lay business

Acquisition Further Positions Global Marine Group for Significant Offshore Power Market...

GMG: launches new safety management system
Posted: 07/11/2017

Global Marine Group launches new Safety Management System

Global Marine Group (GMG) has launched a new Safety, Security and...

Posted: 12/10/2017

Global Marine Group to acquire Fugro’s trenching and cable laying business

Acquisition further positions company for significant offshore power market opportunities Chelmsford,...

Posted: 05/09/2017

Global Marine Group Awarded Order of Distinction from Royal Society for the Prevention of Accidents

Chelmsford, Tuesday 5 September 2017. The Global Marine Group (GMG), a market...

Posted: 31/08/2017

Global Marine Group Chooses Port of Blyth to Extend UK Footprint

Chelmsford, Thursday 31 August 2017. The Global Marine Group (GMG), a market...

Posted: 03/08/2017

Utilising the Q1000, CS Recorder Completes Cable Reburial Project in Three Weeks

Chelmsford, Thursday 3 August 2017. Global Marine Group (GMG), a leading provider...