Sinkhole in Guatemala...Damn!

Before i say this i want to make clear: No im not buying in to conspiracy theories, no i dont believe its aliens, but i seriously doubt that its just a "sinkhole":

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How likely is it that a sinkhole turns in to an almost 100% perfect circle?

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EXTREMELY smooth walls for a sinkhole, and no sloping down to the middle either.
To me it seems very unlikely that nature can create an almost perfect pipe in the ground.. taking the butterfly effect in consideration, its virtually impossible.
But then again, im just a dude reading the news, not a geologist.
 
Before i say this i want to make clear: No im not buying in to conspiracy theories, no i dont believe its aliens, but i seriously doubt that its just a "sinkhole":

EXTREMELY smooth walls for a sinkhole, and no sloping down to the middle either.
To me it seems very unlikely that nature can create an almost perfect pipe in the ground.. taking the butterfly effect in consideration, its virtually impossible.
But then again, im just a dude reading the news, not a geologist.


My dad's the head of the USA's west coast branch of a geotechnical engineering company called Fugro, and their biggest 'partner,' so to, speak is Hayward Baker. As a result, I've interned for both companies throughout high school when I thought I wanted to be a civil engineer. I can tell you that sinkholes scare the shit out of me because of this very thing - they can create almost a perfect cylinder and look like aliens started mining the planet.

Here's a shot from one of the ones in Florida that Hayward Baker worked on - seeing the statistical analysis of the ground in spreadsheet form was shocking, as you'd get columns of super dense soil, then several columns of stuff that looked as if it wouldn't hold a human standing on it, followed by more super dense stuff, with almost zero graduation between the two.

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Difference is that you have an inward slope, both from the ground to the opening, and from the opening to the bottom.

This is how it normally looks:

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As i said, the thing i find odd is that there is no sloping from the ground to the hole, and the walls are near perfect.
But maybe you're right, still looks very different from most sinkholes to me though(And again, im no geologist so i dont know what im talking about! ;)). ;X
 
Yup, in most cases there's an underwater river at the base of the sinkhole - people have been claiming to hear running water at the bottom of this one, but given that it's 30m deep, I'm not sure if they can be trusted. :lol: