Speculative fiction is a broad umbrella category of narrative fiction referring to any fiction story that includes elements, settings and characters whose features are created out of imagination and speculation rather than based on attested reality and everyday life. That encompasses the genres of science fiction, fantasy, science fantasy, horror, alternative history, and magic realism.
The Novrosk Peninsula: the Soviet naval base has been abandoned, the nuclear submarines are rusting and rotting. Cold, isolated, forgotten. Until the Russian Special Forces arrive and discover that the Doctor and his companions are here too.