It shows that these Japanese cars are water tight, and if water did come into
the car, most certainly this video would not exist, because it would have
been destroyed.
It proves what ever car that was driven, it remained water tight. The
car could either be driven, or float like a boat.
I understand that there is a Hugh debre field on its way to the west
coast of the United States, that may contain lots of floating cars.
The question in what you will do if you were caught in such a
situation. We certainly pray the Rosary and ask God for the
forgiveness for our sins until we are rescued, or have to face
Judgment before God.