O menu Extras do Blu-Ray Prometheus revela o que os Engenheiros estavam fazendo: semear a Terra com a vida inteligente :
Scene 7: Arrival of the Engineers
The Engineers touch down on prehistoric Earth for a sacred ritual devoted to the seeding of Intelligent life. Whereas the Theatrical version of the scene is devoted to the Lone Sacrifice Engineer, this early cut features several of his comrades, including the Elder Engineer. The ceremony was filmed with dialogue but unsatisfied with the result, Ridley Scott removed the dialogue entirely.
Como foi mencionado, já havia vida vegetal no planeta. Isso pode ser visto nos tiros de areal.