Dr Gabrielle Walker looks deep within the ice crystal to try to discover how something so ephemeral has the power to sculpt landscapes, preserve the past and inform the future. Show more
Discover 11,128,835 listings and 279,746 playable programmes from the BBC
Dr Gabrielle Walker looks deep within the ice crystal to try to discover how something so ephemeral has the power to sculpt landscapes, preserve the past and inform the future. Show more