How does US 'football pitch' sinkhole compare to world's biggest, and what caused it
![How does US 'football pitch' sinkhole compare to world's biggest, and what caused it](https://i2-prod.dailystar.co.uk/incoming/article33129357.ece/ALTERNATES/s615/3_s4JPG.jpg)
The sinkhole that opened up under a football field in Alton, Illinois stretches out 100ft wide and goes down up to 50 ft, a chip in the surface when compared to some whoppers in China that come with ancient forests