Checking one last time to be sure her respirator and goggles were in place, she nodded down at Natsumi and drew a long, deliberate breath through the filter. Now she would see how her improvised design held up in the field. If she'd made a mistake, she may not live to regret it, or at best, Conrad might have a few choice words for her when they got to clean air.
She popped open another small metal cover near the top door and turned the rotary handle counterclockwise. It stopped with a sharp clack at about forty-five degrees, and with another grating, high-pitched screech the lower door between them and Sune slid shut, separating the group. A staticky and neglected klaxon blared in the airlock warning in broken Nepleslian of the impending toxic air that would soon flood the chamber, and yellow rotary lights flashed, spinning around the walls in an eerie dance.
After a few seconds, the yellow lights changed to green, and the lock on the rotating handle clicked free. Sienna turned it the rest of the way, and the door above them groaned open. Immediately the sickening yellowish haze of the air above whooshed inside, and even through her mask she could smell the sulfur. She had to consciously remind herself not to hold her breath on reflex, just keep breathing.
When she didn't start hacking up bits of her lungs immediately, she climbed out of the hatch and up onto the walkway that circled the dome covering the underground city, looking around at the sickly-looking, barren and rocky landscape that stretched out for miles. This side of the dome seemed largely ignored, as the main landing pad was on the other side, and very little traffic had any reason to come over this way. She stole a glance up and behind her. The monolithic dome stretched up and away until it was lost in the haze, only a few red and white beacon lights pulsing from comms towers and gas vents that jutted out at seemingly random intervals visible.
It had been a good while since she'd set foot on the surface, and hopefully this would be the last time she'd see it.
She turned around on one knee and offered Natsumi one of her hands to help her up and out.