In this Fierce Earth special, Clare and Leo head to Death Valley in California which is officially the hottest place in the entire world, with record-breaking temperatures of a sizzling 57 degrees centigrade. The pair endure a special test to work out what color clothing is the best to wear in heat; Clare finds out what it's like to go to school in the world's hottest place; Leo becomes one of the first people in the world to climb the hidden canyons....

The Sumatra-Andaman earthquake of 2004 is estimated to have released the energy of 23,000 atomic bombs, inundating coastal communities with tsunami waves up to 100 feet high. This program explains the undersea geologic forces that create tsunamis - and considers the possible consequences if a landslide-generated mega-tsunami were to strike the East Coast.