Brazillian sinkhole swallows cars, trucks

I just saw this on global! they show a camera cell video of a semi truck falling into the hole, pretty shocking!

SAO PAULO, Brazil (AP) - A hole being excavated for a new subway station collapsed, opening a huge crater that swallowed cars and dump trucks, and firefighters aided by dogs searched the site Saturday looking for a missing minibus that was feared under the dirt.


A bus co-operative reported a minibus was missing and may have tumbled into the crater Friday when part of a street adjacent to the site slid in, said Etrusco Juarez of the Security Department in Sao Paulo, South America's largest city. He said authorities had not confirmed that the van fell into the hole, which was about 60 metres across, but were searching.

cnews.canoe.ca...

how the heck does something like this happen?

Inadequate geological tests and / or bad engineering prior to excavation would be the first things i would would investigating.

sanc