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Lavrio – Syros Nearshore Protection Work Mattresses Photo 4

Lavrio – Syros Interconnection (Greece) – Nearshore Protection Work & Mattresses

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The Lavrio-Syros II project concerns the second interconnection, between Syros and the Greek Mainland (Lavrio, Attica). This project is the third phase of the Interconnection of the Cyclades to the Greek Mainland Grid.

In summary, the submarine cable route has a length of approx. 108km and a maximum sea depth of approximately 300 meters. The underground part of the 150kV AC Transmission Line on Lavrio side is approximately 1050m long, while the underground part of the 150kV AC Transmission Line on Syros side is approximately 600m long.

Nexans has awarded Asso a contract for the execution of pre-lay mattresses installation, the submarine cable protection up to 100m w.d. and additionally the landfall preparation and assistance.

 Asso’s scope of work included:

  • Preparation Activities // Mobilization Activities 
  • Pre-excavation – Onshore 
  • Pre-excavation – Nearshore/Shallow Waters 
  • Pre-lay Mattresses Installation 
  • Pre-trenching – Offshore/Deep Waters (Syros side up to 100m w.d)
  • Post-lay Burial Operations (Lavrio side up to 100m w.d) 
  • Landing Assistance 


  • Owner
  • Contractor
    Nexans Norway A/S
  • Year
    2019, 2020
  • Location
  • Cable Type
  • Cable Diameter
    201 mm
  • Cable Weight
    48 kg/m
  • Alternative Protection
    Pre-lay mattresses: 85m, Cement bags installation: 60m
  • Trenching Length & Burial Depth
    3600m (Pre) & 5660m (Post) @ 0.5m, 1.0m, 1.6m or 2.0m
  • Jetting Length & Burial Depth
    2110m (Post) @ 1.0m & 2645m (Pre with eductor)
  • Max Water Depth
    120m (@ Jointing area)


Some of the services we provided for Lavrio – Syros Interconnection (Greece) – Nearshore Protection Work & Mattresses 

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