The Nordstream Pipeline - Who Was Behind It?

We sit down and examine the destruction of the Nordstream pipeline that connected Russia to the EU for the purposes of delivering energy. What is the claim being made against the bombing of it? What tactics are said to be used? Also, how could this have been done and maintained secretly? We need to look back in time as we see all of the players that are involved and arrange our players on the game board. As this is accomplished, and the pieces of a real investigation come together with actual documentation, you have to ask yourself, who was really behind it?