en.Wedoany.com Reported - Frequensea, a Dutch offshore decommissioning technology company, announced on July 11, 2026, that its innovative decommissioning tool, specifically designed for the environmentally friendly removal of subsea cables and pipelines, has successfully completed the Factory Acceptance Test (FAT) at J. van Belzen, a steel structure manufacturing expert. This test comprehensively verified the tool's functionality and watertightness, confirming its performance and structural integrity. The tool's vibration module has now been delivered to Deltares, an independent applied research institute in the Netherlands, marking the next critical phase of its qualification program.
Frequensea is a startup spun off from the Dutch marine energy engineering company Enersea in 2024, focusing on developing sustainable decommissioning solutions for subsea infrastructure. Its core product is a subsea cable and pipeline removal tool utilizing patented vibration-induced fluidization technology. This technology liquefies the seabed soil through vibrations at specific frequencies, significantly reducing soil resistance around buried objects, enabling efficient and environmentally friendly extraction of facilities such as subsea cables buried up to 3 meters deep. The tool won the Offshore Energy Innovation Award in 2025.
The successful Factory Acceptance Test marks a significant milestone in the overall tool qualification process. At the Deltares research institute in Delft, the Netherlands, the vibration module will undergo the next phase of rigorous testing. Tests will be conducted under controlled laboratory conditions, with the vibration module buried beneath a sand layer in a dedicated test pool to simulate a subsea burial environment. By gradually varying the operating frequency of the vibration motor, the test team will determine the optimal frequency for soil liquefaction. These results will lay the foundation for the full-scale test program scheduled at Deltares this summer.
Deltares is a renowned independent applied research institute in the Netherlands, specializing in applied research in water and subsurface domains, with nearly a century of deep expertise in water safety, water availability, and subsurface infrastructure.
Once qualification is complete and certified, Frequensea's decommissioning tool will leverage its patented vibration-induced fluidization technology to provide an efficient and environmentally friendly solution for the offshore wind, oil and gas, and other industries to remove abandoned subsea cables and pipelines. This technology minimizes disturbance to the surrounding seabed, supporting the growing demand for sustainable development in offshore decommissioning activities.
