On the night of September 26, near the end of the calm season on the Baltic, a broiling kilometre-wide circle disturbed the face of the sea and a huge mass of methane erupted into the air. The gas formed a cloud that crossed Europe, in what’s considered the greatest single release of this potent greenhouse gas ever recorded.
It was caused by four breaches of Russia’s Nord Stream 1 and 2 gas pipelines, located in or near the territorial seas of Denmark and Sweden. Seismologists detected explosions at a depth of 70-90 metres on the seabed. These were not earthquakes.
Danish, Swedish and German authorities have reported that the explosions were a deliberate act, equivalent to the use of 500 kilograms of TNT.
