I am trying to remember the name of a science fiction either movie or episode of a show like Black Mirror.
The scenario starts where a group of astronauts is scheduled to blast off from Earth and nuclear war starts. They decide to take off anyway and then travel through space. One astronaut realizes the whole thing must be a simulation, due to a type of frost that is supposed to develop on the pipes in deep space, but does not. The rest continue until finally they touch down and make first contact.
What makes the movie memorable is the final scene where aliens are discussing that, yes, the humans have made it through the great filter to interstellar space travel, so they are worth making contact with. But also, the guy who realized he was in a simulation is sitting there terrified. He assumed it was a simulation and he was still on Earth. . . not that it was a simulation by another advanced species.