The ROV survey began with a general visual inspection (GVI) of the pipeline diffusers, concrete gravity anchors and anchor chains. It then performed a contact cathodic potential (CP) survey on the diffuser stems and finally was relocated inshore to carry out a GVI of works which included Larson Pile and Gabion Basket surveys followed by a scour survey of the pre-cast concrete apron and concrete infill sections.

Subsea Vision's managing director Chris Bryant, who had previously surveyed the site as a diver said, 'Using our ROV proved useful when working at depths for longer periods and in the strong currents typical of this area. The ROV was able to complete the project in less time and without interruptions, which was therefore more cost effective and far safer than using a dive team.'

MJ Information No: 18414