Shortly after they turn it, on a message comes up “Warn:  There is another system”, it turns out the Russians have done the same thing, and the system wants a link.  I won’t give away any more of the film, which has some seriously cool looking 70s tech in it (and obligatory wooden panelling everywhere).  I did like the message in the “computer” writing of the time, so made an version in Inkscape, as it would probably make a cool T-Shirt.