If you ever get yourself stuck in a mud bank at the edge of a river and there happens to be a massive truck nearby offering to help you out, our advice would be to take that help.
If not, you might just suffer the same fate as this (presumably Russian) chap, whose inexplicable antics in a Porsche Cayenne result in a tyre explosion sufficiently spectacular to cause some major damage to the bodywork, and to set off the car's myriad airbags.
And the moral of the story? Keep the Cayenne for trips to the shops and a bit of light field work; if you want to ford rivers, use your mate's massive six-wheel truck...