It was an Ancient hangar.
The ceiling arched high overhead disappearing into shadow. Faint lines of Ancient glyph-light traced the ribs of the vault, glowing a subdued blue-light, like moonlight filtered through water, The illumination was not as functional as much as reverent enough never enough to reveal shape, never enough to banish the dark.
The air was still cold, and stale, though the three could hear the life support pumps kicking in and pumping new oxygen to the hangar, dust lay undisturbed across the floor in smooth, shallow drifts, broken only by a single broad landing apron that sloped gently from the entrance.
At the center of the hangar was an Ancient Ship that none of the members of SG-24 had ever seen before. It was larger than a Puddle Jumper but smaller than an Ancient Aurora Class battleship.