I highly doubt that water wouldn't get in through the PCV system. If you look closely the air is being drawn out of the sump via inlet vacuum. As air is being drawn up the crankcase vent pipe, I couldn't see how water could overcome the vacuum and pass down the vent pipe.
Even if the water somehow managed to get in there it would take forever to get the amount of water into the sump, needed to turn the oil to the milky colour.
Not a bad point though DLO01. Good thinking!
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