Swanscombe is one of the last surviving brownfield sites in the Thames Estuary where threatened wildlife can live. On the Kent side of the Thames, to the east of the QEII bridge, opposite Grays on the Essex side, it is an oasis of natural quiet. We took a train and a bus to get there, then walked a sloping path, paved then muddy with the sound of the road dying away. The marsh was full of fascinating life, though empty of people, except for a couple of weekday birders who gave us a wave.

Onwards we walked, heading to the UK's tallest pylon, scraping the sky from the very edge of the river. Impossibly high at 600 feet. We hoped it'd hum, or be drizzling so we'd hear it fizz, or windy so we'd hear a whistle, But instead it stood silently in accepting partnership with its sibling on the other side of the river.

Though strictly-speaking too quiet to record, we tied the mics onto one of the giant pylon's legs anyway, and left them alone. Listening back, days later, we discovered the mics had captured not only splashes of the lapping Thames and the wide spatial feeling of the place, but also some astonishing and unexpected sounds. Listen and hear the gifts from the marsh. Truly, a magical precious location to be protected.

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How many different birds can you hear singing on the marsh? Surprising answers revealed by the winner of the first Radio Lento Golden Lobes quiz see our blog!

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Find out more about the campaign to Save Swanscombe Marshes.