Mikasa heard Levi shut the door as they entered corridor. It was dark as there were no lights on this part of the corridor, but the sound of their boot steps seemed to bounce of the walls. As the pair rounded the corner they faced the long familiar corridor, the end of which Mikasa thought she could see a dim blue glow.

"Was that there the last time we came through here with Annie and Bertholdt?" Mikasa asked, as she pointed to the faint glow.

"Yeah, I remember seeing it. That's one of the reasons I wanted to come back this way." Levi replied.

"I wish we had a torch or something, it's so dark in here." Mikasa commented.

"What's the matter, are you scared of the dark? Want me to hold your hand?" Levi asked sarcastically.

To Levi's surprise Mikasa let out a hearty laugh, her chuckles ricocheting off the walls. Levi furrowed his brows, amused by her reaction.

"Thanks for the offer, but no." Mikasa said shaking her head, smiling to herself.

They couple continued to walk for some time, until they reached the corridor that led down to the Hotel room where they had meet Annie and Bertholdt.

"We should make a point of going back to that room at some point." Mikasa suggested, "Seeing as we didn't really finish looking through it."

Levi nodded in agreement, as they both started walking down the part of the corridor that had yet to be explored. The further they walked, the more the soft blue glow grew in intensity, with only the clinking of the chains of their cuffs to keep them company.

"We really should make it a priority to get these things off." Levi said cooly.

"I have to agree, I find being chained quite stifling." Mikasa commented.

"Should I assume then, that you find me stifling?"

"Don't put words into my mouth. I just don't like being held back." Mikasa said without turning to look at Levi.

"Tch. Now you think I hold you back?" Agitation was easy to find in Levi's tone.

"Why do you do that? Assume that every comment I make is to try and have a dig at you? What I meant was like with the situation with Annie. You broke up the fight."

"Did you not notice that Bertholdt also stopped Annie? We didn't know anything about them, and I didn't think it wise us getting into a fight with potential allies." Levi stated in a matter of fact way.

"In other words you didn't think I could beat her."

"Now who is putting words into someone else's mouth?" Levi said, "Besides, I've never seen you fight, or Annie for that matter."

The blue light seemed to get stronger and Mikasa had to squint her eyes until she blinked in disbelief. The walls had changed to glass. Except behind the glass was crystal clear water, filled with fish that swam within a forest of kelp and other seaweeds. Mikasa was so astonished that it was several moments before she noticed the stingrays, sharks and other aquatic life.

Just how big must this place be, to be able to fit all of these creatures in here? It's like we're in a bottomless pit...

Mikasa and Levi had both stopped in their tracks.

"You are seeing this too, right?" Mikasa asked.

"Mmm hmm." Levi murmured.

"Why is this here?" Mikasa asked, entranced by the fish swimming between long streams of kelp.

"I haven't the foggiest idea." Levi replied his voice distant, distracted too by what he was seeing. "But someone really went to a lot of trouble to build this."

"That is true, and we are still no closer to knowing why." Mikasa muttered.

"Can you remember anything else about Eren?"

Mikasa shook her head.

"Nothing."

"Not even his favourite colour?" Levi said.

"Funny," Mikasa says sarcastically. "But no. I don't even know what kind of a person he is."

"That's odd."

"What is?" Mikasa asked.

"Earlier you said that maybe whoever put us in here, paired us up specifically with another person... But if you knew Eren on the outside, then why didn't they partner you two together in here?"

Levi finished speaking and raised his handcuffed wrist, as if to emphasise his point.

Mikasa and Levi seemingly as confused as each other, drew a blank. Just then Levi shut his eyes, his brows furrowed together and his thumb and forefinger pinched the top of his nose.

"What's the matter?" Mikasa asked, her voice concerned.

"Nothing ." He breathed, shaking his head.

Mikasa was now decidedly fed up that Levi was not going to let her know what was wrong with him, and so said that they should push on.

They pair continued down the corridor until they reached an opening with no door that led to a massive room, of which all four walls made up a massive aquarium with only the tunnel they had just come from providing an exit.

"I need to sit down. Headache." Levi said, to Mikasa's surprise.

Mikasa noticed a modular bench which she assumed was the seating area, and let Levi sit down in the hope that it might relieve his headache.

"Do you usually suffer with headaches?" Mikasa asked.

"Tch. Well I don't know if I did before I had my memory erased..." He said sarcastically. "But since I got here, it has been near constant. Sometimes it's quite dull, but bearable. But sometimes it comes on quite strongly."

"Does anything make it feel worse?" Mikasa asked.

"Thinking and talking make it worse." Levi said, curtly.

"Anything make it feel better?" Mikasa asked.

Has she always been this abnormally annoying?

This time Levi did not respond, but sighed deeply and lay back on the bench and closed his eyes, covering them with his uncuffed arm. Not sure in what way she could help, Mikasa looked at the floor as she tried to think of something to say or do. Her eyes found their way to her boots, and she noticed that her shoelaces were undone. She crouched down, pulling Levi's arm with the cuffs as she attempted to tie her laces when she froze.

"Levi, do you feel that?" She asked.

"What now?" He responded, obviously annoyed.

"Your hand! Can you feel that breeze too? It's coming from down here!"

Levi opened his eyes to see Mikasa crouched on the floor looking at the bottom of the panel on the bench he was sitting on. She moved her hand around, trying to locate the source of the breeze.

"It's definitely coming from here – look here, from this grate."

Levi too crouched down in order to get a better view at what Mikasa was seeing. There was a metal grate that Levi hadn't taken notice of – he assumed it was part of the design of the furniture. Without warning Mikasa pulled out the grate, and set it to the side.

So, she is abnormally strong too?

Levi saw the beginnings of a grin on Mikasa's lips, as she turned to face him.

"Shall we take a look?"

"It would be a shame not to; after all you've just torn the place apart." Levi replied.

"I was hoping you'd say that." Mikasa said, already crawling on her hands and knees into the small space.

After crawling no more than ten metres, the space opened up so that both Levi and Mikasa could stand up and walk with ease. The tunnel was dark, the only source of light coming from the entrance they had made behind them, and a small amount of light at the opposite end of the tunnel.

"This place is just full of surprises." Levi commented.