Page 13: of Marine Technology Magazine (June 2020)

Hybrid AUV Completes Project for Offshore Wind Farm

Modus Seabed Intervention completed a high speed bathy- metric and depth of burial survey of the inter array cable routes on the innogy operated Gwynt-y-Môr offshore wind farm, using the Modus HAUV-2 (Hybrid Autonomous Un- derwater Vehicle). The Gwynt-y-Môr Offshore Wind Farm comprises 160 Siemens 3.6MW WTGs located approximately eight miles from the North Wales coast in Liverpool Bay in water depths ranging between 12 to 28m. The WTG’s are connected by 161 inter array cables which total circa 147km in length. The worksite is known for high subsea currents, so any solution had to cope with current up to 2 knots.

Modus mobilized its HAUV-2 system, equipped with Op- timal Ranging Orion Cable Tracking System and dual head

R2Sonic 2024 Multibeam Echosounder, on the chartered DP2 vessel “Noordhoek Path-fnder.” Having already performed numerous oil and gas scopes, Gwynt-y-Môr was the frst complete OWF inter array survey performed by HAUV-2. As

Modus Seabed Intervention well as the high current capability, the HAUV can hover and bine depth of burial survey with structure inspection activities can interchange sensors on the vehicle, which ensures system to offer further synergy savings in these challenging environ- fexibility to change tasks, for example the HAUV can com- ments.

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