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How do you remove the fat that blocks London's sewers?

Dallas Campbell and a team from Thames Water use shovels to destroy the fatbergs. It is the most disgusting job that Dallas has ever carried out – he even finds some worms living inside the fatberg!

25 June 2015

3 minutes

This clip is from

Britain Beneath Your Feet—Series 1, Building Britain

How do you explore the roots of a tree without digging it up?

Duration: 02:24

How do you explore the roots of a tree without digging it up?—Series 1, Building Britain

Duration: 02:24