Underland: a deep time journey

First chamber ; Descending

Part I: Seeing (Britain). Burial (Mendips, Somerset) ; Dark matter (Boulby, Yorkshire) ; The understorey (Epping Forest, London)

Second chamber

Part II: Hiding (Europe). Invisible cities (Paris) ; Starless rivers (The Carso, Italy) ; Hollow land (Slovenian highlands)

Third chamber

Part III: Haunting (The north). Red dancers (Lofotens, Norway) ; The edge (Andøya, Norway) ; The blue of time (Kulusuk, Greenland) ; Meltwater (Knud Rasmussen Glacier, Greenland) ; The hiding place (Olkiluoto, Finland) ; Surfacing.