This happened a couple of days ago, I think there was contruction of a subway underneath. 50 metre deep collapse. The construction workers at the bottom of the picture standing at the edge of the hole need to move, because I've seen elsewhere all that land they are standing on is going to slip, video then cuts at 1.35 to a different angle, I think the people made it ok, can't be sure, the people filming this are in danger as well, they just don't know it yet...loads of different recordings of it via various sources online...