Over the Volcano is a look at the scientific and human aspects of volcanoes. In Papua, New Guinea, the Bismarck Sea and the islands around it have had intense volcanic activity. The history of a family in the region helps us understand the stakes involved in its inhabitants returning.In the sea, a Franco-Japanese mission is studying volcanoes off Rabaul's coast. With scientists, we will discover why the region bears witness to such intense volcanic activity.