FishinRod, says "....looks like a collapse into a void space."


Yeah, it makes you wonder how a potential 'void space' was created, and that is what made me think that some dam material got pushed from the force of the weight of the water at full pool.


Excerpt from Robert Crais' "The Monkey's Raincoat:"
"She took another microscopic bite of her sandwich, then pushed it away. Maybe she absorbed nutrients from her surroundings."