Newsletter Subsea Tech – 2026 – Q2 Highlights
HEADLINE
Dam Safety: Subsea Tech on a Mission in Mayotte
The Combani Dam, managed by Eaux de Mayotte (LEMA), is currently undergoing an update of its Safety Study (EDD). For the engineering firm ARTELIA in charge of the diagnostic, part of the structure posed a challenge: drains, piezometers and submerged areas, inaccessible without specialised equipment.
That’s where Subsea Tech comes in!
The mission was carried out in two phases: underwater inspections and photogrammetry of the upstream face, the bottom outlet and the spillway on one side; endoscopic inspections of pipes, drains and piezometers on the other.
Underwater inspections
Endoscopic inspections
On the ground, conditions were far from easy: poor visibility, dense vegetation and a few logistical setbacks forced the team to reorganise its schedule on the fly. Despite these constraints, the inspections delivered the expected results — structural condition, siltation levels, drain and piezometer functionality — providing ARTELIA with the data needed to continue the safety study.
This type of mission, carried out in demanding conditions far from our home base, illustrates Subsea Tech’s ability to adapt and deliver, even when the field decides otherwise.
Equipment used:
TORTUGA XP4
HYDRO 300 – IVM Technologies
Oculus M750d – Blueprint Subsea
Underwater video camera system
R&D PROJECT
Drone conversion of the Efinor MASSCleaner vessel: Subsea Tech, system integrator
The MASSCleaner USV is a modular, unmanned surface vessel designed for a wide range of pollution control and marine service operations.
Subsea Tech contributed to this project, with the vessel designed and developed by Efinor Sea Cleaner. Our role: the “dronitization” of the vehicle, meaning the integration of all onboard electronics enabling remote control and autonomous operation — effectively turning the vessel into a fully operational USV.
This integration covers the navigation, communication and control systems.
FIELD UPDATES
3D Modelling of the draft tube at the Saint-Pierre hydroelectric power plant
As part of a mission carried out for the Centrale du Moulin Saint-Pierre to identify potential structural anomalies, Subsea Tech performed a complete 3D model of the hydroelectric plant’s draft tube, from the turbine cone to the outlet into the Lot river, covering a length of approximately 10 metres.
This 3D reconstruction of the interior of the structure was achieved using an Imagenex 831-A profiling sonar mounted on our Mini TORTUGA ROV, providing a precise and detailed representation of the internal geometry. This mission marks a first for Subsea Tech in applying profiling sonar to the 3D reconstruction of internal hydraulic structures — opening up new possibilities for this type of inspection.
Equipment used:
Mini TORTUGA
Imagenex 831-A
Cleaning and thickness measurements of fire water tanks at the Blénod gas power plant – EDF
Subsea Tech carried out an intervention at the Blénod gas power plant on behalf of EDF, to perform inspection, cleaning and wall thickness measurements on two 450 m³ fire water tanks (Ø 8 m).
The inspection, carried out using our Guardian Micro-ROV, provided a comprehensive assessment of the tanks: deposit mapping, anomaly identification and overall condition evaluation of the walls. Cleaning was then carried out by our AspiROV across the entire floor surface of each tank (approximately 50 m²), taking around 4 hours per tank. The extracted sediments consisted mainly of reddish sludge and metal debris, with a maximum deposit thickness of 3 cm. Finally, 24 thickness measurement points were recorded per tank to precisely assess the corrosion state of the walls.
Equipment used:
AspiROV
Micro-ROV Guardian
Cygnus Mini-ROV probe
Product Spotlight
Guardian IP & Observer IP — Our Micro-ROV range evolves
Subsea Tech is upgrading its Guardian and Observer micro-ROV range with two new references: the Guardian IP and the Observer IP.
This new generation brings significant improvements while retaining the strengths that have made the range a success: ultra-fast deployment, intuitive operation, portability (ROV 7 kg, complete system 25 kg in Pelicase), and a dedicated support team, always as responsive and attentive as ever, to assist you every step of the way.
What’s new
Cameras now offer Full HD or 4K quality, delivering noticeably improved image quality for inspections. The control station has been redesigned with three available configurations: 17″ PC + gamepad, 14″ semi-rugged PC + joystick box, or integrated 17″ console. The surface PC now directly integrates sensor software.
17″ PC + gamepad
14″ semi-rugged PC + joystick box
Integrated 17″ console
Three finish levels
The range comes in three levels: Starter (essentials for budget-conscious buyers), Max (enhanced performance for demanding professionals) and Ultra (complete equipment for the most complex environments).
Revised pricing
Thanks to the optimisations made and the new configurability of the range, these upgrades come with a price reduction of -15% to -30% depending on the configuration, making these systems more accessible than ever.
Download the brochure
Download the brochure
DISTRIBUTION NETWORK
Two new partners
Subsea Tech poursuit le développement de son réseau international avec la signature de deux nouveaux contrats de distribution : Axis 53 au Royaume-Uni et Independent Business Solutions Ltd. en Azerbaïdjan.
Ces nouveaux partenariats viennent renforcer notre présence à l’international et faciliter l’accès à nos solutions pour les clients de ces deux régions.
