About Rotech
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A technology-driven group headquartered in Aberdeen, Scotland — inventing, building and operating the tools that bury and protect the world’s subsea infrastructure.
Our story
Whatbeganin1994withasinglemassflowexcavatorhasgrownintooneoftheindustry’slargestfleetsofcontrolledflowexcavationandjettrenchingtools.
Rotech Subsea Ltd was formed in 2000 after a 70 km pipeline post-trenching scope off the coast of Egypt. Since then the RS range has evolved continuously — from the patented T-shape excavator to hybrid jet trenchers capable of 350 kPa.
Today we serve offshore wind, oil & gas, interconnector and decommissioning clients from Aberdeen, Providence and Taiwan, with more than 600 projects behind us.
Mission & ethos
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Our mission is simple: deliver specified burial and excavation results first time, safely, with the least possible impact on the seabed.
Duty of care
Rotech has a duty of care towards the environment in which we operate, the communities in which we work and to the welfare of employees, partners and clients.
Honesty & integrity
We promote trust, respect and support through open and honest dialogue and maintain high ethical standards with each individual and organisation that we work with.
Continuous development
We provide a working environment where each individual can enjoy a challenging and rewarding role, and the opportunity to develop skills and realise their full potential.
Driven to innovate
We encourage our professional and experienced team to thrive on innovation. Creativity needs space to develop and we offer our team the freedom to succeed.
Thirty years of firsts
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1994
The FlowDredger
Rotech begins development of its first Mass Flow Excavation tool — twin counter-rotating impellers delivering up to 8,000 litres per second.
1998
The patented T-shape
The T8000 replaces seawater drive with oil hydraulics, improving efficiency, stability and offshore maintainability.
2000
Rotech Subsea Ltd formed
Post-trenching of a 70 km, 36-inch pipeline off the coast of Egypt lays the foundation for global growth.
2005
1,000 m deepwater
First deepwater excavation completed at 1,000 metres water depth.
2015
Controlled Flow Excavation
The RS1 and TRS1 launch for offshore wind — narrower trenches, better depth control and up to 215 kW jet power.
2016
TRS2 arrives
8,000 litres per second at 60 kPa for sandwave clearance and freespan correction of cables and pipelines.
2017
Grabs & ultra-shallow
The RSG cable grab and the TRS1-LD for water depths as low as 1 metre join the fleet.
2019
500th project
Rotech Subsea completes its 500th offshore project and manages a full Ørsted scope including vessel charter.
2020
Expansion into Asia
Major cable post-trenching and sandwave clearance campaigns executed in Taiwan.
2022
RSBG Boulder Grab
Debut of the RSBG on seabed preparation works at two offshore wind farms in Asia.
2023
Hybrid RS3
The Hybrid Tooling RS3 launches — jet pressures up to 350 kPa for deep, narrow trenches in dense seabed.
2024
30 years & the USA
Rotech celebrates 30 years in the sector and opens a new office in Providence, Rhode Island.
Leadership
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Dr Donald Stewart
Managing Director
A Chartered Engineer and Fellow of the IMechE with a Ph.D. in Non-linear Dynamics. Donald joined Rotech in 1996, led R&D from 2000 and is a named inventor on many Rotech patents in fluid dynamics and turbo-machinery.
Martin Graham
Director of Engineering & Base Operations
A chartered civil engineer who joined Rotech in 2002, became Engineering Manager in 2005 and played an integral role in growing the Subsea business. Appointed to the Board in 2011.
Stephen Cochrane
Director of Subsea – Global Head of Business Development
Over 20 years of topside and subsea experience across oil & gas, renewables and power, in senior design, project management and business development roles.
Kevin Cargill
Director of Field Operations
Began in subsea survey systems in 2000, returned to Rotech in 2015 as Operations Manager to support the RS range expansion, and joined the Board in 2023.
Engineering & fabrication
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Design & R&D
Fluid dynamics, turbo-machinery, hydraulics and controls — our engineers hold patents across the RS technology.
Fabrication
In-house machining, welding and assembly at Rotech House keeps quality and lead times under our control.
Fleet maintenance
Every tool returns to Aberdeen for inspection, testing and upgrade before its next mobilisation.
HSEQ
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Our HSEQ goals are uncompromising and shared by every member of the team, onshore and offshore.
ISO 9001:2015 certified, ISO 45001 aligned and working towards ISO 14001.
Global presence
Aberdeen-built.Deployedworldwide.
Aberdeen, Scotland
Group HQ, engineering, fabrication & mobilisation base
Providence, Rhode Island
US office opened in 2024
Taiwan
Local entity serving the Asian offshore wind market
Memberships & partners
Start a conversation
Putthirtyyearsofseabedexperiencetowork.
Tell us about your cable, pipeline or seabed challenge. Our engineers will recommend the right RS tooling and a delivery plan — typically within one working day.