Iron Sky: The Coming Race (2019)

Although their plan to lay dormant on the moon until the right time to strike failed, the Nazi's lunar military base has found a new purpose. It is the last refuge for humanity following a devastating global thermonuclear war. However, a desperate team of survivors must venture back to earth and into the Hollow World beneath its crust in search of a power that could either save humankind or wipe it from the universe forever.