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This might not be the most scientific take, but the description reminds me of the Elvish boats of Lothlórien.

Did Tolkien possess advanced knowledge of viking seafaring?

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He was very knowledgeable about history and that informed a lot of his writing, so it's quite likely.
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When is the last time someone used a vessel like this to sail to Iceland? I’d pay for someone to do that. Amazing what our ancestors accomplished.
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There was an archaeologist who drowned last year during an attempted crossing from the Faroe islands to Trondheim.

https://www.bbc.com/news/articles/cnvyge44nppo

https://www.oldsaltblog.com/2024/08/american-archeologis-die...

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2016?

https://www.drakenhh.com/expedition-america-2016

Not exactly the same type, but a recreation of a viking longboat.

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Look up the book called the Brendan voyage. Leather boats from Ireland to Newfoundland. They run into trouble around the ice floes. Great book.
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