Before any installations on the seabed, it is necessary to conduct pre-engineering survey on the proposed installation location or route. Typically, the information is acquired using a combination of techniques:

• Seabed bathymetry and topography:
  Echo sounding or swath echo sounding (particularly in areas of uneven seabed, outcrops, corals, pockmarks, sand waves, etc)
• Seabed features and obstructions:
  Traditionally by side scan sonar, modern mosaicking systems will provide an acoustic "photograph" of the seabed in which prominent features and morphology can be more easily understood and interpreted.
• Detection of ferromagnetic objects and anomalies:
  The Magnetometer system will be deployed to identify metallic objects, such as pipeline, cable and metallic debris.

The design of subsea routes or any subsea constructions normally takes a long period of time to be completed. When a pre-engineering survey for designing a route is done, since numerous events and changes might have taken place on the seabed in the long run, it is necessary to perform another survey within a brief period of time which is called pre-installation survey.

Running a pre-installation survey ensures us whether there are any new sunken objects and debris or not. Therefore, this operation is a decisive factor in subsea constructions.

All Results for pre-installation survey are presented in the following reports:

• Final text report "Pre-installation survey final report"
• Alignment sheets

After the installation of pipeline, post-lay survey operation plays a vital route in determining the free span locations. Spans should be corrected by placing grout bags beneath the pipeline and filling them using ordinary Portland liquid cement or grout. The below figures demonstrate some detected free spans using two technologies, side scan sonar and multibeam echosounder, while these two types of data are integrated:

Geophysical data provides vital information on the geology of the sub-bottom strata, required for any engineering, construction, drilling, and production and mining activity.

What are we trying to find out through a geophysical site survey?

• Water depth, seabed relief, seabed gradients
• Obstructions, debris, wrecks, existing installations
• Seabed sediment types
• Shallow water geology, foundation conditions, trenching conditions
• Geo-hazards such as shallow gas

A precise positioning is a fundamental parameter for any survey and engineering tasks during sea operations. We are capable of providing the required equipment with your related projects on the scheduled time.

During barge support near the platforms, we are able to prepare a safe and accurate barge and tug management system for anchor handling operation.

We offer the following activities during construction survey support:

• Pipe lay and cable lay positioning and touchdown monitoring
• Construction barge and support vessels positioning
• Anchor handling support
• Structure installing guidance
• Acoustic underwater positioning
• ROV survey sensors and system integrations

A rig movement will be done when Mobile Offshore Drilling Unit (MODU) moves from one well location to another. Our profession is to provide positioning and navigation for the MODU, while moving from one location to the next.

We have sufficient experience in jacket and subsea installation by utilizing the most recent methods and technologies. Precise positioning system will be set up for jacket installer barge, jacket or any offshore construction that should be installed on the seabed.

In many cases, for offshore installation or inspection operations, it would be essential to have a highly accurate positioning system.

• Diving positioning support
• Deep water ROV positioning support
• Spool installation positioning support
• Pipe line support installation

Prior to design and building of a spool structure, the engineering studies and special underwater measurements are essential to be conducted to avoid waste of money and time in offshore operation.