I'm sooo sorry, guys! I really shouldn't be starting a new story, I still have so many to finish, but I started writing this one for my little sis (she really loves BioShock, so that's what this is based off of) and I thought you guys might enjoy it, so... Tada! *nervous chuckle* Anyway, please enjoy this nice little crossover-thing!

Full Summary: Even as a newcomer to deep sea diving, Matt knew that swimming too deep or disobeying orders from his boss could jeopardize the job he had worked so hard to obtain. But there was so much the depths of the ocean held so much that had yet to be discovered an he just couldn't help himself. But he never in his wildest dreams thought he would ever discover anything like this...

Warnings: Blood, violence, language, use of 2p!s and fems, mentions of drug use, and an insane author who doesn't quite know how to end the story yet! (I'll be accepting the opinions of my readers on what they want to happen in the story.)

Prologue

If anyone asked Matt why he chose to be a marine biologist, he would tell them that it was because of the view. He felt more at peace underwater with the fish and the undersea flora than he did on land. Even after so many sleepless nights working on the boring jobs and experiments his boss forced him to do, he couldn't find it in him to hate what he did. All it took was jumping into the frigid water around the base he was stationed at to calm him down from anything. Even his brother marrying his high school sweetheart. Even his parents rather nasty divorce. Anything. Unfortunately though, his boss still though he was much too inexperienced to do any deep sea exploring yet. He protested everytime, but Ludwig remained adamant that he wait until he had more experience. He always lectured him for atleast an hour on the dangers of trying to explore deeper waters without knowing exactly what you're doing. Matt knew exactly how to dive, he had been taught all the steps and requirements. But he held his tongue and didn't argue with his superior. Much. Maybe once or twice. Maybe more. But he wanted to keep his job so after a while he would just stop arguing and go to a nearby hockey rink to vent his frustrations. Many people had told him that he should have chosen to be a professional hockey player as his career, he was gifted at it. But it held just as many bad memories for him as good ones. And he had wanted something that would calm him, not rile him up and make him aggressive. And being underwater turned out to be his calling. Besides, the fish never screamed insults at him. Or tried to knock his head off with a hockey stick. Or give him a concussion. You get the picture. The fish were just way better to him.

All that aside, today was an amazing day for Matt. Ludwig had finally given him clearance to go deep sea diving. The only bad thing that happened was that Tommy, his twin brother, and Chiarra, Matt's ex girlfriend and now Tommy's wife, had decided to visit. And bring their two rambunctious (read: troublesome) children with them.

"Are you sure you're ready to go into the actual ocean? You could get really hurt." Chia asked him worriedly. Inwardly, Matt was scowling, and asking her to just shut up and stop acting like she gave half a damn about him. She had been the one to break up with him and then get with his brother, after all. Matt wouldn't be at all surprised if she had been with Tommy before they'd even broken up. But even after all that, Matt still cared enough about her and his brother to be polite.

"Yes, I am more than ready to finally go diving the way I've been trained to. No reason to worry." He said, rolling his eyes.

"Quit worrying so damn much, Chi-Chi." Tommy told his wife, who then hit his arm and pointed to their twin toddlers.

"Don't cuss in front of them. I don't want them picking up that nasty habit." She scolded her husband lightly. Matt did scowl then and continued to pull on his gear, more than ready to get started on his day's assignment. It was nothing major. He was just going to check the local fish population and tag the ones that needed it. But it was still deep sea diving and that's what he wanted.

"Why don't you two go back to your hotel? You can't just wait here all day." He suggested, hoping they would take the hint and leave. He didn't really think they would, but a guy could hope. Tommy was an asshole and Chia, while she was startlingly intelligent at times, could also be as stupid as a rock. And unfortuantely for Matt, she couldn't read the atmosphere at all.

"Okay. It is about time for the kids to take their naps. Call us when you come back to the surface?" Chia asked, to Matt's surprise and relief. He agreed and they left. It must be his lucky day. He finished getting ready and began his descent into the water.

Matt had just finished tagging the fish when he saw something. The water was dark and murky, given how deep he was, but it caught his eye. A light. Below him.

'Is there another diver?' He thought, trying to think of anyone else that may have been assigned during his shift. He couldn't think of anyone. For a moment, he debated on whether or not he should investigate the light. His boss would be pissed and might not allow him to go diving again. But on the other hand, he could discover a new species of fish. In the end, his natural curiosity won out and he swam towards the light. The closer he got, the clearer the water became. A monitor on one of the gauges on his suit started to go off, signalling that he had traveled farther than his suit's capacities would allow. He needed to turn around. But he was starting to see more lights and even movement in the water below. He had to know what it was. His eyes widened in shock when he finally got close enough to see what it was. It was a city. He swam between large buildings, the sea life seemed to coexist with the human structures. He'd never seen anything like it. The first thing he thought of was the legendary city of Atlantis. Had he found it? As he swam past windows, he saw people in the buildings partying and having fun. He was utterly astounded. Then he heard a loud shriek. When he spun around, he saw what looked to be a human in a armored diving suit. It looked too thin to be human though. It screeched again and Matt could have sworn his ears started to bleed. Then the gauge on his oxygen tank gave off a loud warning signal. It had burst. Matt froze in horror and shock, feeling as though his heart had plummeted to his feet. He was far too deep to swim to the surface to get air and he had a feeling that the creature wouldn't let him leave regardless. Then he realized how little air he really had left when his vision began to blur. Just before he lost consciousness, certain that he was going to suffocate down in the lost city in the ocean, he saw a sign that only contained one word. Rapture.