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Captain Sonar: Upgrade One Expansion is the first expansion for the
innovative and hit board game Captain Sonar. In Captain Sonar, up to
eight players take on roles manning a submarine in a fierce battle against
rival players. This new expansion adds new elements to your games,
including five new scenarios, two brand new weapons, and different
ways to play the Captain and Radio Operator roles. Together, these make
your games of Captain Sonar even more compelling and exciting than