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It's not the sub that's being unstable. On the contrary, it is actually too stable - LOL. So stable that if the peri always stays at the same depth, waves however are of different heights. In brief, what you take as sub instability is the waves (higher or smaller) that constantly wash your periscope.
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The point is not about waves washing my periscope but about a steady aim. For example to place the horizontal line of the stadimeter correctly and getting an accurate reading from the scale. This much more difficult when the periscope goes up and down all the time.