In 1845, Sir John Franklin led an expedition in search of the northwest passage with two boats, aptly named HMS Terror and HMS Erebus, and never returned. To this day people search for clues as to what became of them, and what they did find carried horrifying implications.

Sources:

Beattie, Owen, et al. Frozen in Time : The Fate of the Franklin Expedition. Vancouver ; Berkeley, Greystone Books, 2017.

Brandt, Anthony. Man Who Ate His Boots: The Tragic History of the Search for the Northwest Passage. Random House, 2010.

Palin, Michael. Erebus. Greystone Books Ltd, 25 Sept. 2018.