Like the post on the HP said, there's not a lot of info about exactly what happened here. But I'm going to say go ahead and think operator error was involved. Yikes. I seriously can't imagine what it would be like to drown a new truck...

 

That truck was pretty far in the water. I have seen them slide in some, but never that far. But it was in park.

 

The full story must be pretty interesting.