I have altered some compartments to improve the stability.  Suddenly the
error: Model part bad: Negative waterplane area.

What can cause waterplane to become negative.


The Negative Waterplane error message is usually the result of a deduction
extending outside the boundaries of whatever it is deducting from.  If you can
have a waterplane cutting the model in such a way that it passes through the
deduction and the net waterplane area is negative, you will get this error

When there is flooding, the flooded spaces deduct from the hull.

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