The COBRA cable project consist of the power link between Denmark and The Netherlands and it has been developed by and TenneT TSO B.V. 

The cables system that was installed is composed by:

  • 2 High Voltage Direct Current (HVDC)
  • 1 Fiber Optic (FO) cable

BorWin3 project refers to a 900MW DC grid connection system in the North Sea cluster 8 developed by TenneT.

Prysmian Group has awarded Assodivers the submarine cable jointing operations of the COBRA and BorWin3 offshore sections, mainly along the following KPs:



  • KP 106
  • KP 163
  • KP 50
  • KP 261
  • KP 219


  • KP 71


Vessel / Equipment used

  • Ariadne
  • Triton XLS ROV

Project Specifications

COBRA Project & BorWin3 Project - Jointing

Prysmian PowerLink Srl
Cable Type:
Power 2x HVDC Al & 1x FO
Cable Weight:
Power: w.a 45.3kg/m w.w 32kg/m FOC: 3kg/m w.w 2kg/m
Cable Diameter:
Power: 147.5mm FOC:35mm
Service Provided:
HVDC bundle Jointing
Owner: and TenneT TSO B.V
North Sea
Max Water Depth: