Title of older movie about snakes in desert?

I'm 21 years old and probably about 12 years ago I remember seeing a
movie or documentary on tv that took place in a desert and featured
some sort of underground concrete research laboratory in the desert
(of the US) that was infested with rattlesnakes. I believe it also
showed how the snakes were making their way into houses via plumbing
systems etc. I am desperatly trying to recall the name of this movie /
documentary. Does anyone remember seeing something similar?

Thanks!