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CSL-OWL’s Subsea Rock Installation Vessels

  • Purpose-Built
  • DP2
  • 21,000 DWT
  • MGO & Methanol

Our subsea rock installation vessels feature a cargo capacity of 17,500 metric tonnes, dynamic positioning (DP2), and the ability to operate on marine gas oil (MGO) and/or methanol, providing a pathway to zero-emission operations. Purpose-built for optimal flexibility, our vessels will deliver efficient and cost-effective subsea rock installation services in water depths up to 100 meters.

Currently under construction, the first vessel is expected to begin operations in August 2026, with the second to follow in November 2026.

Vessel Features

Our vessels combine advanced technology with operational flexibility to deliver highly efficient, cost-effective and seamless subsea rock installation.

  • High-Accuracy Rock Installation
    Capable of installing rock material up to the 60/300 kg grading (heaviest rock weighing up to 450 kg).
  • Installation Depth and Methods
    A Tremie Pipe with active motion compensation ensures precise placement of rock material at any water depth up to 100 metres.
  • Cargo Hold Flexibility
    The cargo holds can accommodate various rock gradings.
  • Transport Belt Capacity
    Transport belts are designed to handle rocks weighing up to 1,500 kg.
  • Larger Armour Gradings
    A side chute can be used to install larger armour gradings.
  • Optional Larger Rock Installation
    Excavators can be used to handle larger rocks, up to 10 tonnes.

Vessel Specifications

Technical Details

  • Flag : The Netherlands
  • Class : Bureau Veritas
  • Length Overall : 166.80 metres
  • Breadth, Molded : 40.00 metres
  • Design Draft, Molded : 5.50 metres
  • Deadweight : Approximately 21,000 tonnes
  • Accommodation : 45 POB can temporarily be increased to 60 via TLQ

Performance and Efficiency

  • Maximum Sailing Speed : 12 knots
  • Economical Speed : 10 knots
  • Fuel Flexibility : operates on MGO and/or Methanol
  • Dynamic Positioning 2 (DP2) : Equipped with Differential Global Positioning System, (DGPS), High Precision Acoustic Positioning (HIPAP), and laser-based positioning sensors (Fanbeam)

Rock Installation Capabilities

  • Rock Carrying Capacity : 17,500 tonnes
  • Maximum Installation Rate : 2,000 tonnes per hour
  • Maximum Installation Depth : 100 metres
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