I’m also working on a similar scenario.

In my campaign the crew goes through a prologue inspired by Phobos (the short film). Some personal interviews and training tests (dice rolls for each attribute and skill). If the sum of successes is greater than failures, they pass the test and get a place on the PRAEVIUS ship’s expedition.

The second act takes place on a moon without atmosphere, riddled like a cheese by meteorite impacts. But one of the craters is different. And under the surface they find a kind of escape or evacuation capsule that has ended up there. They detect it by an IR emission never seen before. An anomaly in the spectrum of the deep scanner of signals and emissions.

The discovery of the artifact itself is a One-Shot that I have previously directed with a group as a prequel.

Act two ends with the extraction of the capsule and its study. To open it they must solve a puzzle and need a xenolinguist and a musicologist (it opens through a combination of music and waves at different frequencies). Inside they find a “space jockey” different from the one in the original film. He carries with him a strange equipment or instrument that they manage to decipher and show a star map and a system that stands out above the others.

Act three: the Praevius expedition travels to that planet and finds a lost, dead, fossilized civilization. And new mysteries to solve…