For the artist Katie Paterson’s work, ‘Vatnajökull (the sound of)’, 2007–08⁠, a live phone line was created to an Icelandic glacier, via an underwater microphone submerged in Jökulsárlón lagoon, an outlet of Vatnajökull. The number 07757001122 could be called from any telephone in the world, and the listener would hear the sound of the glacier melting.