And yet, we know what happens. We know the Xenomorph gets on board. Looking at the PDF of the Sulaco , you can physically see the design flaw. The maintenance sub-levels—the "mouse holes"—connect directly to the primary armory air scrubbers.

“Alien: The Blueprints” by Graham J. Langridge - Unboxing

In the dark corridors of the USCSS Nostromo , long before the facehugger latches on or the chestburster makes its grand, bloody entrance, the story of Alien is told through technical drawings. For decades, fans of Ridley Scott’s masterpiece have been obsessed with the gritty, analog future of 2122—a world of cathode-ray tubes, industrial chain-link flooring, and, most importantly, blueprints.

: Players of the Alien Roleplaying Game use these schematics as digital maps and "props" for their campaigns.

It transforms the Xenomorph from a movie monster into a piece of interactive engineering. It allows you to see the piston-hinge in the jaw, the rivet in the spine, and the chaotic geometry of the tail.