You don't actually access it yet, the idea will be that after you find the armor (sealed in it's vault surrounded in the energy field) you go into the elevator to find a temporary suit, which will teach the main jetpack and air pressure mechanics.
You fight monsters, do some Create Mod engineering puzzles and parkour, and eventually find the energy field generator, which you overload, which lets you return and access the Armatura, which then you'll be able to progress to the rest of the facility and so on
pretty sick stuff
Also if you're wondering about all the nether portals and lava pools on the outside of the build (which is never seen as the facility is canonically underground) it's just ambience, just to make noises and particles through the walls
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