<Li> Christie Peruso as Geo - Tech Vargas, a researcher </Li> <Li> Jay Anstey as Dr. D, a researcher </Li> <P> The crew had originally intended to shoot in the mountains of Bulgaria, but after the country had endured one of its largest blizzards, they opted to return to South Africa . Filming took place in the Cape Town area which is where Tremors 5 was filmed . The opening scene was filmed in the desert made to look like snow with filters and video processing techniques . The nice weather was explained by climate change causing unusual warmth in the area . Having worked on the previous film series, the crew used CGI for many of the Graboid scenes . </P>

Where is tremors a cold day in hell filmed