https://www.pcgamer.com/metro-exodus-story-trailer-showcases-a-rough-ride-through-russia/

The tunnels of the Moscow Metro are a terrible place to live after the end of the world, but the surface—even after the air has cleared and the snow melted away—isn't exactly a summertime picnic either. There are monsters up above, and an awful lot of non-human unpleasantness too. 

The new Metro Exodus trailer is narrated by Ana, the best of the Spartan snipers and also Artyom's wife and traveling partner aboard the Aurora, the train that will carry them out of Moscow and and across the blighted Russian landscape. Artyom, the lead character of the first two games, has always believed that life persisted outside of the Metro: The year-long train ride in Exodus "sees these hopes and dreams put to the ultimate test in the crucible of the Russian wastelands."