The contrast in the extremely rudimentary form of xelite mining and the use of tungsten, obtained from xelite, in the most complex instruments of nuclear technology.
| Directing | Vladimir Carvalho | Director |
| Writing | Vladimir Carvalho | Writer |
| Sound | Fernando Cerqueira | Original Music Composer |
| Editing | João Ramiro Mello | Editor |
| Camera | Fernando Duarte | Camera Operator |
| Camera | Manuel Clemente | Camera Operator |
| Camera | Walter Carvalho | Director of Photography |