Nepal earthquake: How does the search and rescue operation work?

http://www.bbc.co.uk/news/world-asia-32490242

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International teams of rescuers and medical experts are arriving in Nepal to help hunt and care for earthquake survivors.

The United Nations, which estimates eight million people live in the 39 districts affected by the earthquake, is helping to co-ordinate rescue efforts.

Many have been left homeless by the disaster and the country is already reported to be running out of water and food. There are also frequent power cuts.

The British organisation, Search and Rescue Assistance in Disasters (SARAID) has sent a team of 14 experts with 1.5 tonnes of specialist equipment. This includes an electrical power generator and power tools for cutting through concrete and steel.

They also have their own tents and food supplies, so they will not be a drain on local resources.

But how exactly does such a large and complex search and rescue operation work? Click on the labels in the interactive below for more.

How a search and rescue operation is carried out