Trencher Moonfish Displays Jan De Nul's Innovative Creativity – Heavy Lift News
28 Nov 2022

Trencher Moonfish Displays Jan De Nul’s Innovative Creativity

Jan De Nul’s Moonfish buried the first section of the two Hollandse Kust (noord) sea cables in the seabed, from the beach up to 3km offshore, at a depth of about 6m to 8m.


The Beachlanding for the sea cables with view of Moonfish on the beach at Wijk aan Zee – Photograph copyright Jan De Nul and Flying Focus


From 3km offshore, the submarine vehicle UTV1200 took over, laying the cable up to the ‘offshore socket’ on the transformer station located 18km off the Dutch coast.

The Moonfish, on wide tracks, has been designed and made to lay cables underwater, up to 35m deep.

Water is pumped through a floating pipe to the powerful water jets on the Moonfish’s long metal sword. With this, the Moonfish makes a deep trench in the seabed, where it simultaneously lays the cable at a depth of up to 8m. The trench is then immediately backfilled. As a result, the cables are safely protected against future coastal erosion.


Moonfish burries the sea cable to a depth of 8m on the beach at Wijk aan Zee – Photograph copyright Jan De Nul and Jorrit t Hoen


Ward Mertens, Project Manager for Jan De Nul Group: “Preparations started this year on the 1st March, immediately after the storm season. Our daughter company Soetaert installed four long cofferdams for the sea cable’s reception pits. Simultaneously, we dredged away the sand dunes just off the coast to clear the path for the Moonfish. The Moonfish set to work at the end of May. Controlled from the jack-up installation vessel just off the coast, the machine drove up to the beach. With the onset of a beautiful sunset, the machine got moving for the first time and buried the first sea cable at a depth of 8m. A fantastic moment after almost 2 years of engineering!”

Featured Title photograph

Jan De Nul’s trencher ‘Moonfish’

(photograph courtyesy of Jan De Nul )



Related news