Working as a teaching instructor for a class of U.S. Navy students who were being taught documentary cinematography, Lucas directed the short film Electronic Labyrinth: THX 1138 4EB, which won first prize at the 1967–68 National Student film festival, and was later adapted into his first full-length feature film, THX 1138.
Lucrând ca profesor-instructor la o clasă a Marinei unde studenților li se preda documentarul cinematografic, Lucas a regizat filmul de scurt-metraj Electronic Labyrinth: THX 1138 4EB, care a câștigat premiul I la Festivalul național de film pentru studenți din 1967–68 și a fost mai târziu adaptat în primul său film de lung metraj, THX 1138.