What happened

The UK Ministry of Defence said the Russian vessel Yantar, described as a naval intelligence-gathering ship capable of mapping and potentially interfering with undersea cables and pipelines, was detected loitering over UK critical undersea infrastructure in November 2024, prompting deployment of Royal Navy assets including HMS Cattistock and RFA Proteus alongside RAF maritime patrol aircraft to monitor it. Yantar returned to the UK's Exclusive Economic Zone on 20 January 2025, entering waters roughly 45 nautical miles from the British coast; the Royal Navy shadowed it with HMS Somerset and HMS Tyne for the following two days as it transited toward the Dover Strait and on into Dutch waters. Defence Secretary John Healey publicly disclosed the deployments and modified rules of engagement allowing closer tracking, including authorising a Royal Navy submarine to surface near Yantar as a deterrent signal, and stated: 'We see you. We know what you are doing. And we will not shy away from robust action.' Healey's statement linked the concern to the broader pattern of suspected undersea-infrastructure interference in Europe, including the Estlink 2 electricity-interconnector and cable damage in the Gulf of Finland on Christmas Day 2024 attributed by Finnish investigators to the tanker Eagle S (recorded separately in this dataset), but did not claim that Yantar had caused any confirmed cable or pipeline damage in UK waters. Russia did not dispute the vessel's presence but has generally rejected characterizations of its naval activity as hostile reconnaissance against undersea infrastructure. This record documents confirmed, officially disclosed vessel movements and monitoring, not a confirmed act of sabotage or physical damage to any named UK cable or pipeline.

When cited sources give different casualty, damage or spill figures for this event, they’re reported side by side above rather than merged into one number. See how confidence levels work.