ShepherdsDog ShepherdsDog:
The electrical system shorts out and they can't get the windows down, and there'd be no way that they could force the doors open until the pressure equalized(cab would be full of water). A 4 m deep slough isn't very deep but that would be enough weight to trap them. Had they been able to break the windows on the doors with a hard object such as a hammer, chances are they'd be alive.
Which is why there is a hammer in my glove box