The first project, which is the fourth contract from Tampnet in a series of critical North Sea installations, is for a platform to platform cable system that includes four branching units.

It will incorporate 74.157 kilometres of fiber optic cable, with the cable for the second platform being laid to allow for platform connection at a later date.

One of the company's key installation vessels, Innovator, has been contracted to complete the work following the successful installation of a prior Tampnet project in 2014.

Initially, mattress deployment work was undertaken across various oil and gas pipelines, as well as umbilicals, prior to Innovator laying fibre optic cable in the centreline of a channelled mattress on the seabed nearly 120m below the surface.

The mattress design was developed specifically for this project utilising concrete mattresses and combining this with recycled rubber to provide greater support to the cable over the pipeline crossings and ensure the cable was retrievable for future maintenance operations, should this be required.

The inventive solution required the extensive capability of Innovator and the Mohawk submersible ROV.

The second contract from Tampnet is for 36km of fibre optic cable installation in the southern North Sea.

At one end of the system, the cable end spur was previously installed ready for connection. Global Marine, using its installation vessel CS Sovereign, will recover the spur for the first platform, install a cable joint and lay cable to the branching unit 1km from the cable end module location near the second platform.

The CEM is also being installed by CS Sovereign and will be used to tie into another subsea control system. These two subsea structures will be connected at a later date.

"Both projects are currently in progress and going well," Global Marine director, installation Andy Lloyd said.

"Some of the work is more challenging than usual, to say the least, notably the installation of the CEM.

"Positioning this subsea structure accurately was a crucial part in the overall delivery of this important project and relied heavily on sound project engineering both in the planning phase and subsequently during marine operations.

"I am pleased to say that we have already deployed the CEM successfully which demonstrates our skill in this field and is testament to the proven capabilities of our marine installation vessel, crew and equipment."