They just built a couple of hundred "dwellings" in huge hideous boxes on a site in a lovely Bedfordshire town that I used to live next to in which they lost a HiMac 10 - 12 yrs ago when it went to dig drainage ditches, so soft and boggy was the ground. I sunk up to the roof due to vibration liquefaction.
The ground is pretty close to Fuller's Earth, a substance that shows similar thixotropic properties to cornflour. It is in a valley through which runoff water flows. Good luck, residents! Were you even told? The heck you were!
Oddly enough since then I have never managed to find the press reports of that well publicised incident. Curious, that!
Loads of dry, flat land around there too.