Tatort Ostsee - Wer sprengte die Nord Stream-Pipelines?: A year has passed since the attacks on the Nord Stream gas pipelines, and it is still unclear what actually happened at the bottom of the Baltic Sea at that time. ARD, Süddeutsche Zeitung, and DIE ZEIT have joined forces for a large-scale investigation and set out to find the alleged perpetrators. An investigation into one of the most spectacular criminal cases of our time, an attack of historic proportions.