June 4, 2021


Our n-sea twin-prop and quad-prop excavation systems were designed and developed in-house; each system is constructed to be non-contact and nonintrusive, ensuring controllable and safe operations for operators’ and clients’ assets.

Identifying a gap in the market for shallow water excavation tools, N-Sea have developed the twin and quad-prop controlled flow excavation tools for trenching and deburial operations.


Mass flow excavation systems, signed and developed in-house, are used for trenching and deburial on varying types of seabed in advance of operations starting. Such operations include IMR, leak detection, repositions and decommissioning.


N-Sea’s Twin-prop and Quad-prop are versatile systems. Each fitted with a 2d or 3D sonar survey package to provide accurate data for pre and post surveys and for live monitoring during operations. The fully integrated remotely operated systems have proven success in a range of seabed formations, including sand, silt, gravel, rock dump, drill cuttings and clays.


MFE is a technique that is used for trenching and deburial at which a high volume of water is being produced and directed downwards onto the seabed to break up the seabed formation and to disperse the seafloor evenly.


Innovative features include:

  • Specific non-contact/non-intrusive safety features to allow work to be undertaken upon sensitive subsea structures, pipelines and cables.
  • Innovative twin and quote prop systems produces a high flow volume of water which breaks up seabed formation and disperses the seafloor evenly.
  • Live monitoring capabilities during operations and accurate data provision via 3D sonar survey.


  • trenching and deburial
  • depths of up to 3 m can be achieved
  • accurate data for pre and post surveys
  • live monitoring during operations.


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