I was closely involved in a situation where a 2005 WK diesel inadvertently was driven through deep water (over 3 feet) and ingested more water than was good for it. The engine blew a lot of white smoke and stopped. The inexperienced driver (a car salesman from the Jeep dealership) just wound the key and it fired up again and apart from a slightly off beat idle, the engine appeared to have suffered no serious damage.
However, this vehicle which at the time was a used trade in owned by the dealership with 73,000kms, continued to sound a little "off beat" so it was pulled down and found to have one quite noticeably bent connecting rod, which ended up as a paper weight on the dealer principal's desk as a constant reminder of the incident.
The subsequent repair, that was covered by the dealerships insurance ended in excess of NZ$30,000!!! The connecting rod could not be purchased on it's own. It had to come as a set with a crankshaft and pistons!! - That was close to NZ$20000 on it's own.
A friend of mine now owns that Jeep which now has 127,000km on the clock and is still purring like a kitten.
I have been avoiding any water crossings deeper than damp grass ever since