I am not sure, whether the Faraday-effect would protect crew & boat entirely.
Maybe the ocean-water conducts lightning better than a metal Uboat? If so, then lightning would find an easier channel straight towards the ocean-surface, then to a Uboat.
But I do know, that lightning is a pretty rare event out on the open oceans.
Check
this map....taken from
this article.
Quote:
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Lightning. It avoids the ocean, but likes Florida. It's attracted to the Himalayas and even more so to central Africa. And lightning almost never strikes the north or south poles. These are just a few of the things NASA scientists have learned using satellites to monitor worldwide lightning.
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