LONDON (CBS SF) — A smelly problem deep beneath the streets of London has been eliminated.

Work crews from the Thames Water department worked in cramped and gut-wrenching conditions 13 feet below an east London street for nearly nine weeks removeing a mass made from fats, oil and waste that had been nicknamed “fatberg” by the locals.

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Experts are making good use of the broken up fatberg. It is being converted into 4-thousand gallons of biodiesel — enough to power 350 buses for a day.

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Crews used high-pressured jets and their hands to break up the 130-ton clog which measured 800 feet from end to end.

But they know their job is not completed. The fatberg will return.

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Every year, workers clear up about 80,000 fatberg blockages in the London sewer system at a cost of over $1 million-a-month.