Wreck Detection at the Eurofos Terminal

Intersub – Marseille (13) – 2024

Subsea Tech was commissioned by Intersub to locate and identify a submerged vehicle wreck at the Eurofos terminal. Given the low-visibility conditions typical of this type of harbour environment, the team deployed a Mini TORTUGA ROV equipped with a Blueprint Oculus M750d acoustic camera to precisely locate the wreck. Once identified, a visual inspection was carried out to document the condition of the vehicle and provide the client with the information needed to plan salvage operations.

Inspection of the Floating Pontoon of the Société Nautique de Marseille

Sous-Marine Services – Marseille (13) – since 2019

The underwater works contractor Sous-Marine Services calls on Subsea Tech’s expertise every year to carry out the inspection of the underside of the pontoon of the Société Nautique de Marseille, located on the Vieux-Port. These periodic inspection missions aim to identify any signs of deterioration — in particular rust — that could affect the structural integrity of the pontoon over time. Subsea Tech uses a mini-ROV Guardian to follow a predefined route covering an area of approximately 40m x 20m and retrieve inspection footage. Operations are supported by divers whose role is to clean marine fouling before the ROV passes, ensuring high-quality images that allow defects to be precisely identified and monitored from year to year.

Inspection of the aqueducts in the old lock of Tancarville

TETIS - Tancarville (76) - 2019

Subsea Tech was mandated by TETIS to perform the inspection and the estimation of the silting level of the aqueducts located on the Seine side of the old Tancarville lock. The operation was carried out with a Guardian mini-ROV equipped with an Oculus M750d acoustic camera, an essential tool for navigation in almost zero visibility conditions. The acoustic camera was also used to estimate silting levels at the entrance and within the aqueducts. The Guardian’s small size allowed it to be inserted into the pipes to check the silting level within the aqueducts.

Expertise of the Jean Reveille and Estienne d’Orves piers in St-Tropez

City of St-Tropez - St-Tropez (83) - 2016

Inspection works were carried out using CAT-Surveyor USV and Norbit WBMS multibeam sonar to produce a complete 3D model of the quay over 500m length on the pier of the Port of Saint-Tropez, allowing in particular to identify suspicious areas, including protrusions, and to measure them with precision thanks to the 3D model generated. In addition, our team used a Teledyne Blueview BV5000 high-resolution (1.35 MHz) 3D imaging sonar, operated from the dock itself, to model specific defects in even more detail. The BV 5000 is a 3D imaging scanning sonar that provides ultra-high resolution modeling of underwater objects and infrastructures, with a spherical range of 20 m radius. The system is mounted on a tripod with a 360° pan & tilt and is therefore particularly suitable for local 3D modeling. A visual inspection by mini-ROV completed this mission.

By combining these equipment, Subsea Tech offered a complete solution for the inspection of subsea infrastructures, in any visibility conditions.