I have been on a trip where a 3l diesel Patrol drowned in a massive bog hole, he had an air filter and turbo full of water when we dragged him out after the car just stopped. The water was over 1 m deep and deep and well over his bonnet, pulled the glow plugs out, drained the air box, pulled the turbo off and literally drained a good up of muddy water from it. Turned it over for about 3 minutes to squirt all water out the glow plug holes , put it all back together and it fired up.
It can be saved on a odd occasion