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You may be looking for the book the whale is from.

Moby Dick was a massive white whale from the novel Moby-Dick. The Twelfth Doctor found this book boring, and bemoaned, "Honestly, shut up and get the whale." (TV: Extremis)

The whale existed in the Land of Fiction, as well. When the Cybermen invaded the land, they cyber-converted the whale, and fitted it with torpedo tubes. (AUDIO: Legend of the Cybermen)