The sounds that comprise Marshland (Helicotrema Mix) were all recorded on the Dengie Peninsula, an area of tidal mud-flats and salt marshes that lies between the estuaries of the rivers Blackwater and Crouch. Microphones were submerged beneath the rising tide, held above retreating waves, wedged into a decaying wooden watch-tower buffeted by strong winds and lowered through the gun slits of a pill-box, where nesting swifts called to fledglings and flew in and out the Second World War concrete structure’s openings. Though left raw and unprocessed, the sounds have been layered in a series of movements between interiors and exteriors, between what passes over and what happens underneath. This Essex coast once formed part of what archaeologists have named ‘Doggerland,’ a mesolithic land bridge which joined Britain to continental Europe, and the recordings were made during fieldwork for a film project with Chiara Caterina in the weeks before the UK population voted on the referendum to leave the European Union.