Every human being vanishes at once, all 6.6 billion, and the film tracks what happens to the planet they leave behind. Built from CGI projections, scientist interviews, and footage of real abandoned sites like Chernobyl's Pripyat, it moves hour by hour and year by year: power plants failing within days, pets and zoo animals fending for themselves, dams eventually giving way. Engineers and ecologists explain how quickly infrastructure depends on constant human maintenance, from subway pumps to nuclear reactors, and what happens once nobody shows up to run them. Skyscrapers crack as unheated pipes freeze and burst, cities are reclaimed by weeds and then forests, and predator populations swing wildly before settling into new patterns. The film pushes the timeline out centuries and millennia, imagining bridges collapsing, coastlines drowning old subway tunnels, and eventually almost every trace of human civilization erased except the most durable structures. It's less about extinction than about revealing, by removing us, how much continuous effort holds the built world together.