The world's longest mountain range is actually in the middle of the ocean - the mid-Atlantic ridge, at more than 40,000 miles long. But who knows about these mountains? How high are they? Where are they? What lives on them? Hannah is joined by South African actress and TV presenter Amanda Du Pont, who spent two weeks on a Greenpeace ship on a research expedition to Mount Vema in 2019. And she welcomes marine scientist Lucy Woodall back into the studio, who's led expeditions to seamounts all around the world.

Also - there's another update from the Arctic Sunrise en-route to the Galapagos Islands. They've made a stop-off at the ocean mountains near Galapagos.

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