Unmarked ships keep turning up near offshore windfarms, submarine exercise zones, and gas pipelines in the Baltic Sea, often with their location transmitters switched off and armed personnel aboard. An international journalist team from NDR, WDR, Süddeutsche Zeitung, and broadcasters in Belgium, the Netherlands, Norway, Finland, and Estonia tracks these vessels and tries to decode the morse code messages some of them transmit. The film lays out why police and military forces struggle to intervene even when a ship's behavior looks clearly suspicious, and what that legal gray zone means for critical infrastructure Germany and its neighbors depend on. Interviews with intelligence officials and maritime security experts frame the ships as part of a broader hybrid warfare campaign Western agencies say Russia is running against European states. Footage of the ships themselves, radar tracking data, and cross-border reporting give the investigation its shape, building toward the same unresolved question hanging over every sighting: what are these vessels actually doing out there, and who is meant to notice them before it is too late.