We often talk about living on a blue planet, but when we think we’re talking about the ocean we’re generally only discussing what’s in it: fish, whales, pollution and ships. But that is to miss the biggest story on Earth, because it’s the water itself that sets the scene for everything else. This lecture will outline how the ocean engine works – its internal anatomy, how the components move, and how this engine has directly influenced our history and culture.

This lecture was recorded by Professor Helen Czerski on the 30th of October 2025 at Bernards Inn Hall, London

Dr Helen Czerski is a physicist and oceanographer with a passion for science, sport, books, creativity, hot chocolate and investigating the interesting things in life.

She is an Associate Professor at the Department of Mechanical Engineering at University College London and her research focus is the physics of breaking waves and bubbles at the ocean surface. These bubbles change underwater sound and light, help transfer gases from ocean to atmosphere (helping the ocean breathe) and also eject ocean material into the air. She has spent months working on research ships in the Antarctic, the Pacific, the North Atlantic and the Arctic, and is an experienced field scientist.

Helen has been a regular science presenter on the BBC for 15 years, covering the physics of the natural world in BBC2 landmark documentaries (including ‘Orbit’, ‘Operation iceberg’ and ‘Supersenses’), and the physics of everyday life in a range of BBC4 documentaries (including ‘From ice to fire: The incredible science of temperature’, ‘Sound waves: The symphony of physics’, and ‘Colour: The spectrum of science’, along with many others). She currently co-hosts BBC Radio 4’s flagship climate and environment programme Rare Earth.

Helen's first book Storm in a Teacup won the Italian Asimov Prize and the Louis J. Battan Author prize from the American Meteorological Society. Blue Machine won the Wainwright Prize for Conservation Writing. She was awarded the Institute of Physics Gold Medal in 2018 for her work on physics communication, and an Honorary Fellowship of the British Science Association in 2020. She has been a Trustee of Royal Museums Greenwich since 2018, and was one of the 2020 Royal Institution Christmas Lecturers, giving her Lecture on the topic of the ocean.

The transcript of the lecture is available from the Gresham College website: https://www.gresham.ac.uk/watch-now/liquid-engine

Gresham College has offered free public lectures for over 400 years, thanks to the generosity of our supporters. There are currently over 2,500 lectures free to access. We believe that everyone should have the opportunity to learn from some of the greatest minds. To support Gresham College's mission, please consider making a donation: https://www.gresham.ac.uk/get-involved/support-us/make-donation/donate-today

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