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Originally Posted by geosub1978
In the type XXI submarines there was a switch which automatically lowered the masts including periscope at speeds > or = 9kts because the vibration was imposible to be removed. That switch could be ON / OFF / SURFACE MODE.
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True!
(IIRC, all schnorkel-equipped subs had "speed limits", so that the strain from the water would not break the equipment.)