Since Russia's invasion of Ukraine, Finland and Sweden have been planning to join NATO. This would bring the Baltic Sea almost completely under the Alliance's control. Russia sees this as a threat, and the Baltic Sea is suddenly at the centre of geopolitics.
Measured by the potential of the powers that confront each other here, it is suddenly one of the most dangerous regions in the world. The documentary focuses on the present, past and future of this front on the high seas and thus on the motives, and actions, of the central actors.