Great Yarmouth Outer Harbour

Case Study Overview

Diving contractor responsible for all health & safety planning and team/equipment support to perform visual and tactile bed-level survey to locate obstructions to piling operations.

Full surface supply diving equipment, Broco cutting equipment and team operating off client supplied floating plant. The dive team located debris using circular search patterns& installed lifting points to steel sheet pile debris using Broco ultra-thermic cutting equipment. Rigging was subsequently installed for lifting operations using client lifting plant.

At a glance

  • Location: Great Yarmouth Outer Harbour – North and South breakwater arms
  • Project Value: Award £5,500, Outturn £5,500 (NB support costs only)
  • Programme Duration: 3 days including mob/demob – all work completed in 3 days.
  • In-House resources Work: Supply of all diving H&S documentation for diving support works, as well as supply of containerised surface supply diving equipment, Broco cutting equipment and team
  • Contract: Van Oord Purchase Order agreement

The Solution

Initial enquiry was taken on a Sunday afternoon and mobilisation of team and equipment undertaken early the next day. All scheduled support work was executed in a safe manner and delivered on time and within agreed budget.

Agreed diving support scope was successfully achieved, however the lifting capacity of the client supplied lifting plant was not sufficient to remove the piles from their embedded location. Excavation options were put to the client, however the decision was taken to move the caisson centreline by 0.5m thus out of alignment with the debris – R7M subsequently provided diving support to ensure that this was achieved thus ensuring there were no further obstructions to piling operations.

Value Added
Provision of suitable methodology to achieve the works, containerised dive system, underwater cutting equipment & suitable tested rigging to undertake the operations.

Lift of caisson into positionGreat Yarmouth

Caisson installed
Great Yarmouth




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“Our relationship with Red7Marine and their Personnel through all stages of this challenging Project has been based on partnership and co-operation. A huge consideration was given at the initial phase to identify potential difficulties. This has been followed by development of various scenarios and methods of addressing such difficulties which provided a great benefit during actual works. We look forward to continuing the relationship with the Red7Marine team.”

Kate Sellers, Site Agent BAM Nuttall