Date registered: Dec 2005
Vehicle: W211 E320 Bluetec R129 SL500 - $1300 car ........ Ford F350 6l
Location: CA Bay Area
Mentioned: 9 Post(s)
Quoted: 1163 Post(s)
Hydro-lock at low speed doesn't have to mean engine damage. Even if a rod is slightly bend, it can be replaced.
I would start with pulling the plugs, making sure there is only oil in the pan and trying to turn the engine. With some luck (actually lot of them) the water will blow off and the engine will fire up. I did lot of water drainage from my PWC engine, but that is 2-stroke.