Thanks to my former student Kurtis Garbutt for the heads up on this one. The video below shows the progressive development of a road in Thailand. I suspect that this initiated as a culvert failure, with multiple collapses due to undercutting:
The final frames of the video show an overview of the site. Check out where the people are standing!
As an aside, Kurtis also runs a very interesting blog on natural hazards - take a look. It is a very useful resource with a scope that goes way beyond my site.
Yikes! Not only the over view of where people were standing but clearing our filmer stood on the edge a few times.
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