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HydroDigger - Fisher Offshore’s Advanced Underwater Excavation System

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Fisher Offshore’s HydroDigger, together with its integrated Launch and Recovery System (LARS), provides a safe, secure and highly effective solution to subsea excavation.

Deployed over a vessel side and operated remotely from its deck, the HydroDigger works by producing a controllable column of water, the pressure of which effectively excavates the seabed. This minimises or eliminates the risks associated with physical contact, especially around complex subsea assets.

HydroDigger excavation equipment can be rapidly mobilised from our network of Fisher Offshore bases and agents worldwide.

Download the HydroDigger Brochure 2007

By employing real-time sonar monitoring, the HydroDigger enables precision excavation both within constrained areas and over long distances. This makes it ideal for:

SEABED PREPARATION

  • Sand wave levelling
  • Burial of seabed obstructions
  • Glory hole excavations

INSPECTION REPAIR & MAINTENANCE (IRM)

  • Deburial of subsea assets
  • Rock dump removal
  • Channel maintenance
  • Location and burial of dropped objects

PIPELAY

  • Lay trenching
  • Freespan and crossing corrections

DECOMMISSIONING

  • Exposure of piles and drill templates
  • Burial of redundant structures
 		  

See the HydroDigger in action 

Launch Launch 3.81 Mb

Rock Dump Removal Rock Dump Removal 3.03 Mb

Crossing Connection Crossing Connection 3.89 Mb

De-Burial De-Burial 2.38 Mb

Free Span Correction Free Span Correction 3.28 Mb

Pre-Lay Trenching Pre-Lay Trenching 1.76 Mb

Post-Lay Trenching Post-Lay Trenching 2.22 Mb

Sonar 3 Sonar 3 884.73 Kb

Sonar 4 Sonar 4 694.76 Kb

 

 

 

 
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