In article ,
Roger wrote:

I have also wondered what would happen with something as heavy as a full
size JCB on soft ground. I don't know for sure how much they weigh but
one advert claimed 7 tons which must be at least twice the weight of my
neighbours tractor.

Not quite the same, but http://www.diggerland.com/visiting/disastergallery.htm
has some diggers that appear to have sunk impressively


Darren