The mass is now blocking a stretch of Victorian sewer that's 820 feet (250 meters) long, longer than the length of two football fields, which, wow.
In a sewer region located about 11 feet (4 meters) under the Whitechapel neighborhood in London, workers are just beginning to dismantle an inanimate but uniquely revolting inhabitant - a vast and rock-solid plug of oily waste charmingly known as a "fatberg".
Weighing the same as 11 double decker buses, the fatberg easily eclipses the one found in 2013 in Kingston, southwest London.
Thames Water, which is in charge of London's water, said the fatberg was one of the largest it had ever seen. "It's a total monster and taking a lot of manpower and machinery to remove as it's set hard".
Thames Water said work will continue throughout September until the sewer is clear.
The Whitechapel fatberg is said to be around 10 times bigger.
"We check our sewers routinely, but these things can build up really quickly and cause big problems with flooding. Often we have to shut roads entirely, which can cause widespread disruption, especially in London".
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Images show that the sewer totally blocked by the 250-metre (273-yard) long fatberg.
Thames Water clears up an average of three fat related blockages and five blockages caused by items including wet wipes every hour from its sewers in London and the Thames Valley.
They have launched a new campaign called "Bin it - don't block it" in a bid to reduce the amount of rubbish put down sinks and toilets.
Rimmer also said that if this particular fatberg wouldn't have been discovered during a routine inspection, it would have likely caused "raw sewage to flood into the streets".
A huge "fatberg" - the weight of 11 double-decker buses - has been discovered in an East London sewer.
A fatberg is a congealed mass of fat and various products that have been flushed down toilets but do not dissolve like toilet paper. Thames Water says the team is progressing at a rate of 20-30-tons a day.