There is much we don’t know about the natural gas leaks from pipelines under the Baltic Sea. Here are three key questions: Question: How hard would it be to cause a blast at the bottom of the the Baltic? Answer: Amid all the talk of covert sabotage, carrying out blasts underwater at sea is not an overly complicated task, especially if – as in the Baltic Sea – it does not involve great depths. Military divers of all nations are practised at doing this. For example, sea mines are usually blown up under water in a controlled manner, rather than being defused. The pipeline itself is estimated to b…