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Just remembered a film i watched ages ago but cannot remember the name of it for the life of me. Its about an american mountain town that seems as if everything is normal but one of the residents realises they can’t leave. Turns out that the world actually ended and mutated creatures roam the rest of the world and the town is surrounded by a wall and the government are hiding in a mountain storing humans in stasis to protect the human race. Any clues anyone? Think it begins with an E?

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Some aspects of your description match the premise of the TV series “Wayward Pines” (2015):
https://www.imdb.com/title/tt2618986/
Quote from this IMDb reviews page:
https://www.imdb.com/title/tt2618986/reviews
“A secret service agent finds himself in a strange town after an accident, with apparently no way out.”
“This is a couple thousand years in the future and Wayward Pines is the last holdout for humans who have been cryogenically frozen from two thousand years ago. A holdout against dangerous, carnivorous mutants.”

Thats the one! Thought it was a film though but now i know its this one without a doubt!