A massive sinkhole has swallowed part of a football pitch built over a mine in Alton, Illinois. Surveillance footage posted on social media shows the ground caving in suddenly, leaving behind a massive crater. The collapse occurred Wednesday morning at Gordon Moore Park, creating a sinkhole at least 30.5 metre in diameter and more than 30 metres deep. The sinkhole appears to be approaching a limestone mine, which has been mining under that section of Alton for many years and is located adjacent