We visit Cork Harbour, Titanic's last port of call before sailing to disaster, to hear the story of one lucky Irish passenger who had to reluctantly disembark at Cork. Alice Roberts meets Waterford Crystal's chief scientist to learn how to turn the local beach's sand into glass. Hermione Cockburn creates her own mini earthquake on Killiney beach with a mercury dish and some dynamite, recreating an experiment performed 160 years ago that led to the understanding of the earth's tectonic plates.