Mission Vectrum is a mini-expansion for Captain Sonar and contains three different sea cards that can be played individually or as a coherent campaign. Each sea card is included four times: two times for the radio operators and two times for the captains. With its 3 missions, the Vectrum campaign make you dive you into a thrilling adventure. A cutting-edge military-scientific conglomerate has recruited experienced crews to test their new equipment in real conditions. Welcome to the Vectrum Campaign, which will take you from Chicago to New York to end with a climax on a secret mission! The Vectrum campaign includes 3 missions, which can be played consecutively in a “campaign” mode, or individually, with their specific rules and constraints.