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Sewer workers say they think they've discovered the biggest ever lump of food fat under the streets of Kingston in Surrey.
The "fatberg", as its been called, weighs 15 tonnes and is as big as a double-decker bus.
It was found after residents complained that they couldn't flush their toilets.
Martin Stew drew the short straw, and went to have a look.
An account making light of the world's largest 'fatberg' discovered in London sewers yesterday has already been set up.
CountyClean, in charge of the repair operation where the world's largest 'fatberg' was found, has taken a survey of the damage with a remote CCTV camera.
This footage is thought to show the beginning of the fatberg under the streets of London.
CCTV investigations in London Road, Kingston found a mound of fat the size of a bus had reduced the 70 x 48cm sewer to just 5% of its normal capacity.
Thames Water has begun repairs to 20 metres of the damaged pipe and work is expected to take up to six weeks to complete.
Thames Water say a lump of fat the size of a double-decker bus has been discovered and removed from a London sewer.
The 'fatberg' of food fat mixed with wet wipes formed in drains under London Road in Kingston.
Gordon Hailwood, waste contracts supervisor for Thames Water said:
"While we've removed greater volumes of fat from under central London in the past, we've never seen a single, congealed lump of lard this big clogging our sewers before.
"Given we've got the biggest sewers and this is the biggest fatberg we've encountered, we reckon it has to be the biggest such berg in British history... If we hadn't discovered it in time, raw sewage could have started spurting out of manholes across the whole of Kingston"