This episode shows how Australia's journey as a continent has affected everything from Aboriginal history to modern day mining, and also the evolution of Australia's unique wildlife. Iain visits an opal mining town called Coober Pedy to recreate the breakup of Gondwana, and to also show how Australia's formation led to the creation of a vast underground aquifer. The episode also features cliffs of the Australian Bight which are a reminder to the times when Australia was once joined to Antarctica.