What Happened to the Doomed Franklin Expedition? These Are the Clues

With ice-strengthened vessels that had already proven their worth in the Antarctic, the Franklin Expedition was the best-equipped assault on the Passage ever launched. A little over two months after setting sail, the Erebus and Terror were spotted in Baffin Bay, just east of the Passage’s entrance; and then, they disappeared. None of the crew was ever seen by Europeans again.
 
What happened?

https://www.history.com/news/franklin-expedition-mystery-northwest-passage

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