Wasn't that just in the road though? If you fill an empty hole with earth with not much in terms of foundations then you can get a lot of settlement movement. Ours will have a stadium with piles driven so far into the ground they will act like a drain for the Pacific. It should help bind the earth a bit and so should reduce the chances of that happening.
http://www.liverpoolecho.co.uk/news/liverpool-news/sinkhole-appeared-port-liverpool-12602064