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Re:Vessel Finder by 082349872349872 on Tuesday July 14, 2020 @05:12AM (#23829915)
The two-layer feature of the Strait of Gibraltar:

https://books.google.ch/books?id=nUtLDwAAQBAJ&pg=PA46&lpg=PA...

meant that submarines used to be able to pass in both directions with engines off.

Still physically possible, but no longer worthwhile: https://news.ycombinator.com/item?id=23548220

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