Rats and waste are just about all we associate with sewers - science doesn't often come to mind.
Researchers at King's College, London, however, have applied science to the problem of sewer inspection and come up with a solution.
Quentin Cooper speaks to the scientists who have developed a device that can monitor the condition of sewers and feed the data back to computers electronically. Producer Sarah Empey EMAIL: material.world@bbc.co.uk