Four underwater explosions were registered in the Gulf of Finland not far from Nord Stream pipelines, as reported by Finnish newspaper Ilta-Sanomat on Monday, 24 October.
Explosions were registered approximately 40 km away from the city where the Nord Stream 1 branch starts.
The first explosion was registered at 12:34 p.m. and the other – at 18:33 p.m. (local time).
Explosions were mentioned in the report on seismological observations for the region close to Finland composed by the Institute of Seismology, University of Helsinki. Seismologists registered underwater explosions near Russian cities of Primorsk and Viborg on 20th and 21st of October.
The origin of those explosions is under investigation. Seismologist Jari Kortstrom reports that those underwater explosions were likely caused by the deepening of the shipping channel.
One other possible cause may be the military drills involving the detonation of depth charges or mines.
The Finnish seismologists had also registered the explosions that damaged the Nord Stream pipelines earlier in September.
More on this topic: Reports coming in about major gas leaks from both Nord Stream pipelines in Baltic Sea