Merlyn Thomas is a news correspondent for the British Broadcasting Corporation.

Media caption,

The Danes say there is a gas leak from the pipes.

This week has seen the discovery of four leaks in the major undersea line carrying Russian natural gas to the European Union.

Authorities were warned of the possibility of a deliberate attack because of gas leaks in the pipes.

The EU blamed the leaks on sabotage.

Russia rejected the idea that it had attacked its own oil and gas infrastructure.

The coast guard of Sweden said they had found a fourth leak on the second part of the ocean.

Russia was accused by the EU of using gas supplies as a weapon against the west.

The EU leaders have made it clear that any attack on the energy infrastructure would be met with a strong response.

The military will protect oil and gas installations.

Both of the pipelines contain gas at the moment.

Since August, when Russia shut down the Nord Stream 1 line, there has been no gas transported.

It spans from the Russian coast to north-eastern Germany. Russia invaded Ukraine in February, causing the halt of its twinpipeline.

Underwater blasts were reported before the leaks. The biggest leak at the surface of the Baltic Sea is 1 km in diameter.

Bjorn Lund of Sweden's National Seismology Centre said there was no doubt that the blasts were explosions.

The Russian International Affairs Council is a Moscow-based think tank. There are other ways to live in Europe. They are able to stop the gas deliveries.

Image caption, This map was created before the fourth leak was discovered
  • Russia-Ukraine war
  • Sweden
  • Russia
  • Oil & Gas industry
  • Natural gas