This fatberg is ten times bigger than one which clogged sewers in Kingston-upon-Thames in 2013.
Matt Rimmer, head of Thames Water's waste network, says the fatberg is almost rock solid.
BRITAIN'S "biggest ever" fatberg, which is longer than two Wembley football pitches, has been found lurking under London.
He said the task is "basically like trying to break up concrete".
The giant fatberg blocking up major sewer under Whitechapel Road.
The mess will eventually be disposed of at a recycling site in Stratford, east London. That thing is putting fat and wet wipes into the drains, as Thames Water has discovered what's presumed to be the largest known fatberg in the world beneath streets in Whitechapel. Thames Water who are in charge of unblocking it say it's one of the biggest they've ever seen.
Work will continue throughout September until the sewer is clear.
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CCTV camera inspections showed the sewer to be totally blocked by the fatberg stretching 800ft, 10ft below ground. Such blockages are caused by cooking fat, oil and grease being washed down sinks and wipes and disposable nappies flushed down the loo instead of put in waste disposal bins. "It's fortunate in this case that we have only had to close off a few parking bays to get to the sewer".
Alex Saunders is a Waste Network Manager for Thames Water.
Rimmer said: "When it comes to preventing fatbergs, everyone has a role to play".
Thames water has launched a campaign to encourage residents to dispose of wet wipes in bins rather than flushing them down the toilet and have met with food outlets to discuss how to properly dispose of fat.
Staff from Thames Water usually use powerful suction equipment to break down the blockages and then high-powered water jets to clear the tunnels.
"Yes, a lot of the fat comes from food outlets but the wipes and sanitary items are far more likely to be from domestic properties", he said.