Dredging and marine experts Royal Boskalis Westminster NV has executed the subsea rock installation on the Cygnus field in the North Sea.
This video shows the work being carried out by the fallpipe vessel, Rockpiper.
Gas is expected to start flowing from the Cygnus field later this year and is expected to meet the needs of 1.5million homes.
It will be the UK’s second largest production site of natural gas.
Earlier this year the accommodation module for the Cygnus field set sail from the Burntisland Fabrication’s Methil yard towards its final destination off the Lincolnshire Coast.
Watch the video of the subsea rock installation below.