© StompMan and woman falling into sinkhole
CCTV footage shows what happened during that incident.
As the man and woman get off the train, a patch of tiles in the station can be seen looking slightly out of place compared to the rest of the floor.
As both the man and woman step onto that patch, the section of floor gives and they both fall in.
Another man and woman look on in shock after narrowly avoiding the fall.
According to online reports, the man and woman sustained injuries from their fall.
Absolutely no advance warning. These things seem mostly connected to roads where utilities are tied into the public streets. If the earth is moving around a bit more it could be breaking more pipes where water would erode at the spot. If the earth is moving more, underground caverns and odd places could collapse the earth above into them. Or as others have opined, the earth may be expanding or being drawn out toward a spatial body. The moon acts upon the earth too.
One more thing to worry about.