The Baltic is too far away from China and Germany doesn't have the capability. The only powers that could hit a pipeline 70m underwater in the Baltic without getting caught is the US, Russia and maybe—emphasis on the maybe—the UK.
Russia doesn't really have the capabilities. 70m isn't that deep and the Danes have advanced SONAR that they bought off the US that would detect Russian submarines operating in the area. Anyone operating in the area would need to have a reason to be there, which the US has had.
The Baltic is too far away from China and Germany doesn't have the capability. The only powers that could hit a pipeline 70m underwater in the Baltic without getting caught is the US, Russia and maybe—emphasis on the maybe—the UK.
Russia doesn't really have the capabilities. 70m isn't that deep and the Danes have advanced SONAR that they bought off the US that would detect Russian submarines operating in the area. Anyone operating in the area would need to have a reason to be there, which the US has had.
The UK...now that's an interesting idea.