Deep beneath the Baltic Sea, a remotely controlled submarine releases a mine which nestles beside a gas pipeline.
Other mines are laid at critical junctures along hundreds of miles of piping connecting Russia and Germany. They contain the equivalent of hundreds of pounds of TNT.
When they are detonated – either by a timing device or remotely from a secret control room – the aftershocks are felt 800 miles away and seismologists liken the blasts to earthquakes.
