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Posted: 10-04-2013 22:53 Post subject:

Even rebar is going to fail with a big hole below.

A sinkhole is a cavern, the top of which has eroded away, Some are large, some small, the sacred cenotes of Central America are sikkholes

Fact is, any limestone cavern close to the surface will become a sinkhole, sooner or later.

However, a cluster of such is suspicious, but perhaps it's best to get them located all at once. If they want a subway system, well, it's a thought?

Posted: 20-04-2013 09:28 Post subject:

A new one:

Car swallowed by sinkhole on suburban Chicago street
The vehicle was one of three cars which toppled into a sinkhole after a water main burst in the South Deering area of the city.
[video]
5:36PM BST 19 Apr 2013

A rainstorm pummeling the Chicago area ripped open a sinkhole that swallowed three cars, injuring one driver badly enough that he had to be taken to hospital.

The gaping sinkhole opened up a residential street in the South Deering area of the city in the early hours of Thursday morning after a cast iron water main dating back to 1915 broke during the massive storm.

The hole spanned the entire width of the road. Only the bonnet of one of the vehicles could be seen peeking from the chasm.

http://www.telegraph.co.uk/news/worldnews/northamerica/usa/10006519/Car-swallowed-by-sinkhole-on-suburban-Chicago-street.html

Posted: 24-04-2013 15:23 Post subject:

I didn't find a whirlpool thread, but I guess this is probably a sinkhole that opened under the water.
https://www.youtube.com/watch?v=eqROBTVgL6A

Posted: 24-04-2013 16:19 Post subject:

Posted: 24-04-2013 16:44 Post subject:

A strong maelstrom once was off the cost of one of the Faroese Islands. I catalogue rare book, manuscripts and maps and remembered that because I catalogued this map a few years ago:

http://www.vintage-maps.com/en/Antique-Maps/Europe/Scandinavia/Bowen-Scandinavia-Island-Greenland-Faroe-Islands-1747::993.html

And a hand-colored version here:
http://www.geographicus.com/P/AntiqueMap/OldGreenland-bowen-1747

Allison

Posted: 04-07-2013 09:03 Post subject:

Woman escapes after giant sinkhole swallows her car on US street
A woman driving along a street in Toledo, Ohio found herself trapped in a 30ft wide sinkhole which suddenly opened up in the road.
[video]
8:42AM BST 04 Jul 2013

A sinkhole in Ohio swallowed a car travelling down a street in Toledo, briefly trapping the driver, who climbed out after authorities lowered down a ladder to her.

Driver Pamela Knox saw the vehicle in front of her start to slip into the hole but drive beyond it.
But she was unable to avoid falling into the hole, which measured over 30ft wide and at least 10ft deep.

A Toledo police official said a water main break beneath the road may have caused the sinkhole.
Police said Ms Knox didn't appear to be hurt but was shaken and taken to a hospital as a precaution.

http://www.telegraph.co.uk/news/worldnews/northamerica/usa/10159096/Woman-escapes-after-giant-sinkhole-swallows-her-car-on-US-street.html?placement=rhs1

Posted: 12-08-2013 21:12 Post subject:

[Video shows aftermath]

Sinkhole causes villa collapse

A sinkhole has caused a section of a villa to collapse in a resort in Florida.
Around 30 percent of the three-storey building collapsed on Monday morning and there is concern about another section of the villa which is sinking.
About 20 people were evacuated from the building before the collapse.

Millions of dollars of damage is caused by sinkholes in Florida every year.

http://www.bbc.co.uk/news/world-us-canada-23669910