In 2009, underwater surveys revealed that the pipeline carrying natural gas between Easington and the south side of the Humber Estuary was at risk of being damaged.
"[2][3][1] Although remedial work was undertaken in 2010 and 2012, because the pipeline feeds up to 20% of gas into the National Transmission System (NTS), a replacement project was devised to enable security of supply.
[6] This would then connect to the existing pipeline to Hatton compressor station in Lincolnshire, which in turn supplies gas to the south of England.
[7] A 160-metre (520 ft) tunnel boring machine (TBM), christened Mary,[note 2] started running north eastwards from Goxhill in Lincolnshire in April 2018.
[12] The pipe was then fitted out and flushed with 50×103 cubic metres (1.8×106 cu ft) of pure water to make it ready to receive the new pipeline.
[21] However, in September 2018, Ofgem changed their view and allowed the National Grid to charge £111 million of the cost to consumers.