One of the biggest 'fatbergs' ever seen by sewer workers has been cleared from a pipe beneath government buildings in London.

Engineers spent hundreds of thousands of pounds clearing the congealed mess, below Whitehall, which was said to measure a whopping 66ft long.

Among the waste blocking the two-metre wide sewer were sanitary products, condoms, nail varnish pots, wet wipes and pieces of wood.

But the vast bulk of the waste - which stretched for the equivalent length of two buses - was made up of food from the dozens of restaurants and bars in the area.

Disgusting: Some of the filth discovered included condoms and fat (
Image:
Thames Water)

Staff from Thames Water used powerful suction equipment to break down the blockage and then high-powered water jets to clear the tunnels.

The waste was then pumped to a sewage treatment works in Beckton, East London.

Thames Water has been battling to clear several 'fatbergs' from the sewers around London over the past year.

The company has revealed the cost of clearing the 55,000 blockages they find every year has reached a staggering £1million a month - although not all of these are major build-ups that turn into fatbergs.

Food: Restaurants have been blamed for the blockage (
Image:
Thames Water)

Dave Dennis, Thames Water sewer operations manager, said earlier this year: "We have 67,108 miles of sewers, and that's a lot of pipe to keep clear.

"We spend £12million a year tackling blockages, most of them formed because people have tipped cooking fats down the drain and wet wipes down the loo.

"The sewers serve an important purpose - they are not an abyss for household rubbish.

"Fat goes down the drain easily enough, but when it hits the cold sewers, it hardens into disgusting fatbergs that block pipes."

Stink: Sewers below Whitehall were the worst affected (
Image:
Googlestreetview)

Just two months ago, a fatberg described as being the length of a Boeing 747 was found to be blocking the sewer beneath homes in Shepherds Bush, West London.

The blockage was made up of waste fat, wet wipes, food, tennis balls and planks of wood.

See the huge fatberg in the clip below:

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Staff from Thames Water found the blockage when they checked beneath a 260ft section of road.

They cleared the huge underground pipe using high-powered jets.

A year ago a similar blockage affected residents in Kingston-upon-Thames, Surrey.

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