hydrolocked deisel

you wouldn't need to completely submerge it, just get water high enough to go into the air intake is all, but pretty much it's a yes to your question.

If your vehicle hydraulic locks you're lucky,,,, suck in some water with a few revs up and bent conrods and cracked heads are on the menu

Anything with pistons can hydraulic lock...... even air compressors.

Most of the time it comes back to driver error and stupidity..... "I didn't think that puddle was so deep".

I come from a ski boat back ground. Hydolock is not just a diesels problem . With boats Inboards it is cause when water is forced back up the exhaust. It can bend rods smash pistons cause all sorts of dramas . Keep revs up is the key . In boats normally it is caused when to boat is pushed back off a bank or trailer then someone hits the key . Or in some of the Wake boats it is caused when the motor is lower than the exhaust when they are carrying ballast. The motor can’t push the water out on start up that’s the cause of it . Hope that helps

Most engines which get water into the intake suck in enough to cause a sudden stop to the piston. If this happens you nearly always have engine damage. Filter collapses and lets the water straight in. Turbos don't like it either.

9 out of 10 hydros would occur by attempting the crossing at Nolan's Brook I'd say. There's a bypass track and no need to do it. A snorkel will help, but 38" tyres and a 10 " lift is better - engines don't like being submerged full stop.

A few years back when I put my 75 series ute on its side (on dry land), and the dodgie key dropped out of the ignition meaning that I couldn't turn the engine off. It seemed like forever but eventually it jammed up and stopped. Put it back on its feet and wouldnt kick over. Anyway my mechanic mate told me I had 'hydrauliced' it, so pulled out the glow plugs and cranked it over to blow all the oil out of it. Glow plugs back in and it was a goer, although blew a bit of smoke for the first 20klms or so.

Is this a different concept?
I thought any bit of water was instant death to a diesel?

A cracked head or head gasket will also give hydrolock,
when you turn off with pressure in the cooling system, water can get forced onto the top of the piston, when you go to start, water will not compress, if the battery and starter are strong enough can bend conrods or valves,.... ouch

Cheers Ken