In their book The Fog of War - The First World War in the Gulf of Finland, research divers Juha Flinkman and Jouni Polkko recount the events that took place in the Baltic Sea region during the First World War, and the stories of warships and merchant ships that ended up at the bottom of the sea.

The narrative unfolds on two levels, with events that occurred a hundred years apart running in parallel. The first level of narration is the unravelling of dramatic wartime events based on archived data, which Flinkman and Polkko have studied assiduously. The second level consists of the Badewanne dive team's underwater expeditions to the wrecks lying at the depths of the sea.

Magnificent underwater photography unveils the mysteries of the wrecks lying at the bottom of the Baltic Sea, while historic events dating back to the First World War are brought to life with archived photos of ships, submarines and people.