The ability to navigate in icy seas is one of the most important themes in the historical and contemporary story of human interaction with the sea. Over centuries of development ships are now able to operate safely in and amongst giant ice-islands or semi-submerged floes as deadly as any reef. Specialist vessels have been designed with strengthened hulls, unique bow designs and innovative propellers and rudders.

To find our more Dr Sam Willis spoke with Zach Schieferstein from Lloyd's Register Foundation's Heritage and Education Centre. Lloyd's Register has been classifying ships by originating and regulating rules regarding their design and construction since 1768. They have classed all types of vessels, from the largest bulk carriers to yachts and more specialist vessels such as high-speed ferries and - of course - icebreakers. Their vast archive is a goldmine for studying this type of craft. Sam and Zach discuss the historical development of icebreaker design and propulsion, the significance of the arctic and antarctic in geopolitics and the crucial role of Lloyd's Register in the evolution of icebreaker design and construction.

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