Mars landing revelations

The goal is to establish a foothold on Olympus Mons' slopes before the Pacific Alliance arrives on Mars.
The problem is that there seems to be a problem with the proposed colony location. Investigating reveals a cave where the house dome's support struts are meant to be installed.
Things grow worse: in addition to the cave shifting, there is an impossibly large human skeleton inside. A writing is also seen on the wall.
What appears strange at first quickly turns into complete insanity.
However, that shuttle's return to Earth won't happen until the following year.
59th ONC Prompt. It is 2042. On Mars, the first astronauts touched down. They discover a cave with four phrases scrawled on the wall and a lone human skeleton.