You see that little blue thing? That was a two-story house. There are more pictures at the link.
From the Montreal Gazette:
On Monday night a huge sinkhole opened up and a family home sank into it, in St. Jude, about 77 kilometres northeast of Montreal, and north of St. Hyacinthe. Five nearby homes have been evacuated. All four members of the Préfontaine family were confirmed dead around 8:30 p.m. on Tuesday evening.