Taken from the Music for the Williamson Tunnels CD

A short excerpt from Susan’s Introductory Exchanges installation (1993). A series of audio devices were placed at intervals along the Woolwich Foot Tunnel under the Thames with sounds, including dripping water, activated by passing viewers. Recorded onto looped answering-machine cassette tapes, the audio was played through walkmans and tiny amps and collaged with the reverberant audio of the tunnel itself.