Nord Stream 1

Nord Stream (German–English mixed expression for "North Stream 1"; Russian: Северный поток, romanized: Severny potok) is a pair of offshore natural gas pipelines in Europe that run under the Baltic Sea from Russia to Germany. It comprises the Nord Stream 1 (NS1) pipeline running from Vyborg in northwestern Russia, near Finland, and the Nord Stream 2 (NS2) pipeline running from Ust-Luga in northwestern Russia near Estonia. Both pipelines run to Lubmin in the northeastern German state of Mecklenburg-Vorpommern. Each pipeline comprises two pipes, denoted A and B; each of the four pipes is approximately 1,200 kilometres (750 mi) long and with approximate diameters of 1,220 millimetres (48 in). The combined capacity of the four pipes is 110 billion cubic metres per annum (3.9 trillion cubic feet per annum) of natural gas.

The name "Nord Stream" sometimes refers to a larger pipeline network that includes the feeding onshore pipeline in Russia and additional connections in Western Europe. These Nord Stream projects have faced opposition from some Central and Eastern European countries, as well as the United States, due to concerns that the pipelines would increase Russia's influence in Europe and result in a reduction of transit fees for the use of existing pipelines in Central and Eastern European countries.

On 26 September 2022, the NS1 pipeline experienced multiple large pressure drops to almost zero, attributed to three as of yet unexplained underwater explosions in international waters, rendering three of their four pipes inoperable. The perpetrators' identities and the motives behind the sabotage remain debated despite three separate investigations by Denmark, Germany, and Sweden. On 18 November 2022, Swedish authorities announced that remains of explosives were found at the site of the leaks, and confirmed that the incident was the result of "gross sabotage", while Danish authorities used the phrase "deliberate actions".