London: A 'concreteberg' the size of a blue whale and weighing the equivalent of 20 elephants is currently blocking three London sewers, according to Thames Water.
The record breaking mass, which is 330 feet long and weighs 105 tonnes, was caused by concrete being poured directly into the sewers.
It is lodged under Hall Street in Islington, central London and Thames water officials estimate it could take two months to break down.
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Thames Water operations manager Alex Saunders said the concreteberg was the largest the company had ever witnessed.
He said that as the berg was made up of hard concrete, workers would have to chip away at it using a range of cutting tools including jackhammer pneumatic drills and high-pressure jets.
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An investigation has been launched into who was responsible for disposing of the concrete.
Residents have been warned about the work to remove the berg, which is due to start next week.
