Unexpected Elements - Where do beaches come from?

It’s August, and in the northern hemisphere, many people are hitting the beach to escape the summer heat. And that inspired us to investigate bucketloads of beach-based science.

First up, we find out about the forces that build and shape the seaside.

Next, we discover that the waves from the Hunga Tonga-Hunga Ha’apai eruption reached the atmosphere.

Speaking of waves, we’re joined by Dr Edward Hurme from the Max Planck Institute of Animal Behaviour, who tells us about his research into surfing bats.

And why are beaches disappearing?

All that, plus many more Unexpected Elements.

Presenter: Marnie Chesterton, with Tristan Ahtone and Phillys Mwatee
Producers: Alice Lipscombe-Southwell, with Imaan Moin, Robbie Wojciechowski and Lucy Davies

Published on Friday, 29th August 2025.

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