For offshore cable installation, ROV-Work, Plough Work, Rig Moves and Anchor Handling. JD-Contractor is operating the Subsea Construction Vessel ‘Boulder’. The vessel is based on the Multipurpose AHTS B-type. Engineered, designed and built by Mærsk Supply Service. Boulder can be mobilized with various equipment/setups for work at sea and for Subsea Construction.

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Information Principal dimensions​
Type of Vessel Multipurpose AHTS B-type Offshore Installation Subsea Construction Vessel, Length over all 84.6 m
Dynamic Positioning DP 2 Breadth moulded 18.8 m
Owner JD Crafts A/S Depth Moulded 9.0 m
Operator JD-Contractor A/S Summer draught 7.5 m (9.7 m with the Azimuth down)
  Operational draught 6.20 (8.4 m with the Azimuth down)
  Air draught 30.5 m (29.5 with summer draught)
Deck equipment Gross Tonnage 4.376 tonnes
Towing Arrangement Towing Winch MBP 2 X 400 T
The Maximum Bollard Pull (MBP) 220.4 T
Accommodation 43
Crane capacities Crane Stb (onshore)    11t/14m
Crane Stb (offshore)    5.5t/14m
Crane Aft (offshore)    2.1t/14.5m
Crane Aft (offshore)    0.8t/14.5m
A-Frame out    250 t
A-Frame in    200 t
Main Engines 20.020 BHP
Deck load capacity 1.700 t Auxiliary power 800 kW
Free deck area 684 m2 Speed Max 16 kn, ECO 10 kn
When required the vessel can be equipped for:  
Cable installations
Operation of subsea plough systems
Platform for subsea and ROV work
Deep water Anchor Handling & Mooring operations
Rig moves (towing)
General supply duties