On June 17, 2007, an intrusion incident occurred on Czech Television's Sunday morning programme "Panorama", which shows panoramic shots of Prague and various locations across the country, especially mountain resorts. One of the cameras, located in Černý Důl in Krkonoše, had been tampered with on-site and its video stream was replaced with the hackers' own, which contained CGI of a small nuclear explosion in the local landscape, ending in white noise. The broadcast looked authentic enough; the only clue for the viewers was the Web address of the artist group Ztohoven, which had already performed several reality hacking incidents before. Czech Television considered legal action against the group, and tourism workers in the area expressed outrage (since the program serves to promote tourism in the areas shown).