A 100-TON ‘CONCRETEBERG rock-hard’ blockage’ said to be 100 metre-long (328ft) lurking under the streets of Islington in London

Thames Water in London has specialists with pneumatic drills underground to demolish the ‘rock-hard’ blockage, said to be 100 metre-long (328ft) under the streets of Islington . It is estimated that it will take at least two months to break up unlike congealed masses of fat, wet wipes and other waste that regularly block sewers in London.
This is the biggest “concreteberg” ever found in London’s sewers ,blocking three major sewers and will take at least two months to break up at a possible cost of up to £1 million to clear the 100 tonne blockage.
Previously , in 2017 a “fatberg” weighing the same as 11 double-decker buses and stretching the length of two football pitches was found in Whitechapel but broken up relatively easily with high-pressure hoses and pickaxes.
The limited space and the high-powered drills needed to clear the concreteberg means only two or three people at a time are able to work on breaking up the “industrial scale” obstacle in the sewers.
It is suspected that a construction company poured excess cement down a drain and caused the concreteberg.Thames Water is investigating tthe matter to identify the culprits as , on average Thames water spends £18 million annually in clearing blocked sewers. Sibusiso Ngwenya. source- Evening Standard