All the things you didn't realise you need to know about fatbergs

Fatbergs form when people put things they shouldn't down sinks and toilets, like wet wipes, cooking oil or nappies.

One of the biggest ever fatbergs was discovered in London in 2017. It was 250 metres long and weighed a huge 130 tonnes.

That's the same weight as 11 double-decker buses and the same length as two Wembley football pitches.