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Originally Posted by Albrecht Von Hesse
What has (so far) worked for me has been this: I run submerged at 2kt 24/7 until out of the Bay and into (relatively safe and clear) waters. During the day I pop the snorkel up long enough to refresh the air, and in the mid of night long enough to recharge the batteries and again refresh the air. So far doing that I've managed (Danke Gott!) to avoid being bushwacked by air attacks.
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As I understand it they used the snorkel at night, because the exhaust trail would have been visible in daylight.