they'll find some Ancient and Great Artifact, preserving the Sacred Knowledge of the First Race, and it will turn out to contain 100 gigabytes of video with funny cats.
Added 1 minute ago
that's why option 3, as the most suitable one, is "they are already here".
Знание некоторых закономерностей освобождает от изучения многих фактов.
Мечты сбываются рано или поздно, так или иначе.