There are a series of intertitles throughout the film which read:
- To keep their location hidden from the enemy, Mayak and City 40 were not placed on any map.
- "Plutonium Lake" feeds into the Techa River, which is the region's main water source and one of the most contaminated places on Earth.
- Half a million people living in the Ozersk region have been exposed to five times the amount of radiation as those affected by Chernobyl.
- After the dissolution of the Soviet Union, Russia's secret cities were suddenly recognized as places on the map.
- Mayak stores an estimated 50 tons of weapons-grade plutonium and 38 tons of highly enriched uranium.
- Since her last interview, Nadezhda Kutepova was interrogated by the Russian secret police under their "foreign agent" law.
A number of people featured are not identified for reasons of personal safety. There is a relocated man, a 'chocolate factory' worker & a woman with many dead relatives who are all interviewed anonymously in 2004 archival footage. There is also a male resident with his face blurred, a male nuclear scientist who never faces the camera and four different clients (three women and one man) who all remain anonymous.