Making voices audible over a large distance without electronic amplification.
Sound acts in similar ways to water. Therefore, it can be directed through tubes, as in the cases of ship´s phones or ancient eavesdropping devices.
Up to seven speaking/listening stations interconnected by means of underground tubes and a special sound distributer are installed in the play area. This allows for communication with up to six other participants over extremely large distances, without requiring any electronic amplification.
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