SciFi Movie - Invaders afraid of the color red.

Question

Several years a post-apocalyptic movie came out where people were playing around with radio frequencies and opened a door to intruders. The only protection was taping doors shut with red tape. Was actually a cool movie but the name escapes me.

Answer 1

I think that the movie you're thinking about is "Pulse" http://en.wikipedia.org/wiki/Pulse_%282001_film%29
if you like that one, you may also like "Stay Alive"