Just as the title says, instead of flying to a planet, you fly to an abandoned Spaceship, that a bigger human civilization left behind, and maybe it comes in with it's very own interior.
How it would look like, is the ship we have would fly through the abandoned spaceship's little airshield, which would be still somewhat intact, and the door opens right after it was entering the air sphere, after that its almost the same, the environment would be rusty, dirty or broken, doors would show barely open, energy is somewhat intact for visual, but still good enough to go through to find the "main entrance", there could be holes around that act as additional fire exits.
The alternative of design could also be that this certain Spaceship has fauna growing inside which makes it more like that the air staying inside the ship makes life possible also why theres these monsters (we know from LC) existing there.
The "air sphere or little airshield" would vanish whenever the deadline for stay had reached, and instead of being missing you would die instantly, and the cause of death would be suffocating.
(Pictures in this Thread are mostly ideas of layout, surrounding and entrance possibilities)