Marine Activity Update

On or about the 16th of April 2026, works will commence to pull in the pipe to line the Combined Drainage Outfall (CDO). These works are complex and will involve several vessels and the jack-up barge NP497. Diving operations will take place and a floating pipeline approximately 500m in length will be towed into the harbour.

The majority of the works will take place within the Marine Construction Zone (MCZ), but the floating pipe towage and installation will extend into the greater harbour – this necessitates the closure of the entire harbour to all vessels other than those engaged in construction works for the duration of the pipe pull to ensure navigational safety is maintained. This period of closure will be kept to a minimum and is likely be around 48-72 hours.

Fishing vessels normally launched from the beach south of the Sizewell A intake/outfall towers may launch their boats during this period provided that they do not proceed more than 100m eastward from the beach launch point and then head south to clear the harbour. The remainder of the MFRZ will be included in this closure.

Further information can be found:NtM-19-of-2026-CDO-Pipe-Pull-Works.pdf