For many of us, isolation is disconcerting and challenging, but for wildlife sound recordist Chris Watson, it is something he actively seeks, so he can fully immerse himself in a place and capture its unique sounds in his recordings.

In the last of five illustrated essays, Chris vividly recalls his quest to capture the sounds of isolation when he goes in search of the entrance to the centre of the earth. Inspired by Jules Verne’s novel he travels from sea level to volcanic crater drawn by the unique sounds of Iceland.

Produced by Sarah Blunt for BBC Audio in Bristol.