The libyan red crescent described the scene as like a bombardment and earthquake at the same time. When the dams collapsed a wall of water weighing 1. 5 Million Tonnes crashed down the wadi derna river gouging out huge parts of the city before reaching the sea. To give you a sense of the power of that tsunami 20 centimetres of fast moving water is enough to knock adults off theirfeet here there was three metres of water sweeping away everything in its path. The human cost is colossal this man hasjust found his son and begs Rescue Workers not to touch him. Desperate scenes repeated again and again some people have lost 30, 40 50 members of their extended family. Live now to tripoli. Ahmed abar is a libyan activist. Hes been helping the residents of derna. What are people in the city saying to you . What are people in the city saying to ou . ,. , ,. ,. , to you . Unfortunately the situation is very bad. To you . Unfortunately the situation is very bad. For to you . Unfortunately the sit