production. This was due to the  fact that the animation/graphics seen on the bridge station display  monitors was projected from behind the bridge set walls by dozens of  16 mmm projectors (one for each display screen), as computer  technology was not advanced enough at the time to use real computer  monitors on a practical basis. As a result, the clattering sound of  the noisy projectors nearly drowned out the voices of the actors,  and their dialogue had to be dubbed over later at considerable added  time and expense.