In the early 1950's, oil geologists discovered the signs of a giant tsunami, half a kilometer high, that hit a remote bay in Alaska. After research, scientists concluded that the tsunami was created by a landslide in the ocean off the coast. Since then, scientists who study tsunamis have discovered several sites around the world where major under water landslides could create giant or mega tsunami

Japan's Tsunami: Caught on Camera captures the impact of the earthquake and tsunami that devastated Japan in March 2011, using amateur footage filmed by those caught up in the disaster.

The science behind the earthquake and tsunami that have devastated Japan

A documentary series in which expert scientific testimony and stunning CGI visuals combine to create the most realistic perfect storms imaginable. This edition speculates on what could happen if a mega-tornado were to strike.

Seyi Rhodes meets people whose families and homes were torn apart by a huge mudslide in Sierra Leone in August that killed hundreds of people and destroyed the small town of Regent