When Soviet tanks rolled into Prague in the night from August 20-21 1968,
the Czechoslovak Radio building was one of the first places that they tried
to bring under control. In the process the building was damaged, several
people were killed and dozens injured. Broadcasts went on in secret for
several days, keeping the world informed of what was really happening,
initially from within the building itself, and then from other locations in
the city, using mobile studios and transmitters.