Survey & Subsea

Interocean Marine Services carries out onshore and offshore surveys, and underwater inspections to support exploration, offshore developments, and operations.

Seabed Surveys

Operating from dedicated survey vessels, seabed surveys utilising multibeam echo sounders, sidescan sonar, seabed profilers, and gradiometers are used to map the seabed topography and sub-seabed geology, and to chart boulders, debris, suspected UXO and any other hazards that might hinder construction. Our vessels are equipped with ROVs to carry out target investigation and surveys in deeper water.

Mapping is extended to the landfall and beyond, carried out using UAV*-mounted LiDAR and photogrammetry to survey onshore pipe and cable routes, development sites, and coastal terrain.
Data is collated and presented to assist with planning the layout of the offshore development and acts as the baseline for all future survey work. Interocean also offers data management on a Geographic Information System (GIS) platform to support developers, owners, and operators throughout the asset’s life cycle.

*Unmanned Aerial Vehicle, or drone

Positioning Services

Precise surface positioning services are provided on drilling rigs, and survey and installation vessels, incorporating additional tools such as lasers and acoustic positioning for locating and orientating units alongside offshore structures, while our telemetry system, Inter-Pos, is used to remotely position anchor handling vessels and can be installed on structures during installation.

Acoustic positioning is also used to track underwater activities such as diving and ROV operations, and for construction activities such as spool-piece metrology, and seabed installations.

Laser scanning surveys create a 3D image of a structure or building to provide a basis for modifications and upgrades, while also providing a means of confirming that construction work has been carried out in accordance with design drawings.

Subsea Inspection

Subsea inspection is carried out using an ROV deployed from an Interocean or client-supplied vessel, drilling rig or platform, and is used to carry out subsea structure, pipeline, cable, and hull inspections.

As well as visual inspection, the ROV is equipped with probes to measure marine growth and the performance of the cathodic protection system, while the vehicle can also be equipped for seabed surveys, scour monitoring, marine growth removal, and 3D photogrammetry for mooring inspection and accurate cable protection system imaging.