Well, from what I’ve read, ships in the 1800s used a combination of natural insulation (such as thick wooden hulls and layers of tar) and heating sources like coal stoves or fireplaces to keep warm in cold weather. Of course, it wasn’t always effective and crews had to endure harsh conditions, which is probably why The Terror is so terrifying! It’s amazing to think about how much technology has evolved since then to make sea travel more comfortable and safe.
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