[WP] The moon was actually a debris of an Alien spacecraft, one day it activates and lights flicker all over it.

As Earth began to atrophy mankind created its last bastion for hope on the dark side of the Moon. Thirty miles deep, one hundred miles in length, in a crevice that had only opened up as we set foot upon the surface. Upon entering the crevice the walls began to glow pure white like street lights on a snow covered night. Building like structures protruded from the stone, made of a material that seemed synthetic, and completely alien to anything we had ever known. The fissures in the ground began releasing oxygen, oxygen that cycled back before fleeing to the surface, creating a sustainable atmosphere. We called it the City of Lights, the final human refuge.

"I brought food." I said to my older sister Ava as I plopped a bag onto the table.

Ava and I lived in a shack made of Moon tree's, built after the death of our parent's. We lived at the very bottom of the crevice, not too far from the structures that controlled the sewage.

"I'm not hungry." She said, with her upper body leaned outside our only window.

As her shirt rose up I could see the bottom of her ribs through her skin. According to estimates of how the planets gravity would effect our growth we should all look this way: pale, tall, as thin as skeletons with spray on skin tones. The atmosphere however provided us with everything we needed to be genetically superior to those born on Earth, which meant that her malnourishment was her own design.

"Eat anyways." I said as I pulled an apple from the bag. All the fruit on this planet was either forcefully modified to look how it did on Earth, or remained untouched and albino white.

"Aiden, leave me alone." She said. Her voice was weak.

"When you've eaten." I said, a bit louder.

As she ignored me I shouted "What would Mom think of you withering away?"

"Maybe I'll find out." She turned her head to look at me. The gauntness of her face made me squeeze the apple in my palm.

"Eat." I pleaded as my eyes began to sting.

Ava looked away from me. A rage spiraled through my body. The apple flew out into the water way as I threw it out the window. Ava flinched and fell back onto her cot.

"What the hell are you doing?" She shouted. Her eyes were as black as coal. Her hair fell in black strands across her face.

I left without a word, slamming the thin wooden door behind me. My feet carried me aimlessly along the water way as I took stabbing breaths. I looked up towards the stars which spanned the skyline in an endless drove.

When I returned to my senses I searched the dark bottom floor for the apple I had lost. I found it bobbin up and down as its made its way along the water line, disappearing into what we called the Drain.

Those of us under twenty were instructed to stay away from the Drain. The Drain was a place of darkness and strange machines, filtering the water for future consumption. I decided to enter anyways.

The entrance was pitch black and circular. As my eyes adjusted to the darkness I followed a long a small path besides the flowing water. The place smelt of salt and iron, as hundreds of brown pipes spiraled around the ceiling and the walls, weaving over one another like veins in the human body. I heard a noise to my right, a banging that echoed. As my eyes faced the sound, the pathway disappeared from under me. My legs fell into the cold, surging water.

"Help." I shouted. My voices rang through miles of tunnels with no reply.

My hands desperately gripped the metal pathway, though the water gripped onto me. I felt a cold hand wrap around my wrist. I could imagine the bones quite easily, of the person trying to save me. Their strength was not enough and then we both fell in. The two of us tumbled and clung towards each other until the water gained speed and incline, spitting us out into a foamy pool.

I brought my head towards the water, and my attempted savior did the same.

"Ava?" I gasped as water cascaded down her skin. "Why did you follow me?"

"Because you were being stupid."

"Was not." I yelled. My hands beat against the water to keep me floating.

"Look at where we are." She hissed.

I looked around the open chamber as I searched for a way out. The apple I had thrown from early bounced against the wall in a pool of trash. Some kind of force seemed to pull it forward.

"I think there's a hole over there?" I shouted, pointed my finger towards the apple.

"Through the trash?"

"Yeah." I replied.

"Well, be my guest if you want to test out that theory." She smirked. It was the closest to a smile I'd seen in months.

I dove under water and swam towards what looked like a metal scar, vacuuming bubbles into its opening.

"I found something!" I smiled as I brought my head above water.

"More food?" She asked.

"No. An opening?"

"Yeah, an opening." I paddled harder to keep the warmth in my chest. She shivered blue.

"Just follow me." I said, and before she could argue I swam back down.

Together we pushed ourself through the metal gash, through a small tunnel just big enough for the both of us. A neon red illuminated our path as we swam into a different room.

"Where are we?" Ava gasped as we crawled out of the water.

"I don't know.." I replied.

The two of us ventured down a hallway, towards a metal door with the thickness of a stone wall.

"Where do you think this leads?" Ava asked as her eyes marveled the massive square.

"Lets find out." I said as I clicked a button made of the same alien material as the structures outside.

The door shuttered sideways unto the wall releasing the smell of corpses and ash. A red hologram flickered to life, giving light to the room, and the bones along its floor. The skeletons were humanoid in nature, unlike the black tendrils frozen around them. A figure stood at the center of the room, composed of electric light.

The hologram was blurred but clear enough to see a human face with an extra eye at the center of its forehead. Audio filled the room, composed of human voices in an unfamiliar language.

"Aiden, do you have your translator?" My sister looked at me. With so many nationalities compiled onto the new city it was important to have a translator to understand each other.

"Yeah." I said, as I pulled the small device from my shirt pocket. Immediately the voice was transformed into a harsh form of english from the speakers of the translator.

"Humans of galaxy five-million-five. Upon the date of this recording our race will have been destroyed."

Ava and I faced each other with different forms of the same surprise.

"We've sent the beacon along with this message in hopes that you will be able to prepare yourself for the coming Deluge. A species designed to consume all those they come into contact with, especially those who share our genetic make-up. By the time you receive this message you should have advanced to your early space faring age, sometime after the industrialization of your planet. Until you are prepared to accept the power the beacon contains it will appear to your kind as a moon circulating your planet. Shortly after you uncover the secrets of 'your moon' the Deluge will have found you. It's up to you to develop the weapons necessary to defend yourself before their invasion force can cross the galaxy and destroy you."

/r/WritingPrompts Thread