The Moscow Metro. A monumental feat of Soviet engineering, with a dark secondary purpose - to serve as a refuge in the event of an atomic attack. As the Cold War thawed and the threat of nuclear annihilation seemed to fade, this purpose was forgotten -- except by a few, waiting for the signal, ready to open the vaults ... the last refuge for the remnants of mankind.
![](https://i.ytimg.com/vi/mON5WmA5REk/maxresdefault.jpg)