In fact, I am currently reading "Torpedo Junction", and it has mentioned the Paukenschlag u-boats deployment to the U.S. east coast (we all about this one...). Anyhow, they had met a heap of hurricane-like rough seas so much as they approached in January '42, that they tried to travel submerged as much as they could.
Sure, submerge to conserve diesel... but more so, Hardegen and his other subs just tried to keep the boats from heaving so much on their way.
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