LONDON — A 250-meter long fatberg weighing 130 tons has been discovered blocking a sewer line in London. <br /><br />The huge mass of congealed fat, wet wipes, diapers, oil and condoms formed in a sewer tunnel in Whitechapel, the BBC reported. <br /><br />Thames Water officials said it was one of the biggest blockages they had seen before and that it would take three weeks to remove, according to the BBC.<br /><br />Fatbergs form when people put things they shouldn't down toilets and sinks. <br /><br />The fatberg weighs as much as 10.5 school buses, or a blue whale.<br /><br />The length of the fatberg is actually 6 meters longer than the 244-meter Tower Bridge. <br /><br />Workers began removing the mass this week. Eight workers will use high-pressure hoses to break up the mass, then suck up the pieces into trucks and then transport the waste to a recycling station.