As time ticked away, the tank got fuller and fuller. Nia had literally no idea what to do, at this point in her life, she'd only been taught how to knock someone out, shoot someone, and defent herself, but when it came to huge tanks, filling with water whilst she was in it, she had no idea what to do. Instead she pleaded into the camera for someone, anyone to help her. Nia didn't want to die like this, she knew it was worse than burning alive.

She panted heavily as the cold water rose up her legs, she tried to think of any way to get out but as she looked up, she saw something that looked like a metal grid or mesh that glowed green over the top of her, whilst there was also glass on top of that. At this point, she knew she wasn't getting out.

"The cage." Nia gasped, talking into the camera, knowing someone would be watching. She struggled to fight the onslaught of tears that she felt coming, "Above me there is a mesh, it's glowing green, and there is glass over the top of it. Even if Kara found me, I can't get out."

DEO Base

Alex watched anxiously as Winn typed frantically trying to find a location, "I've got her!" He gasped, "I've sent the co-ordinates to Supergirl and Sam, they should be able to find her there!"

Alex quickly got onto the coms, "Supergirl?"

"I'm on it. I'm just hoping it isn't a false lead." Kara replied as she flew straight towards the location.

"You and me both." Alex sighed heavily, noticing the water was now up to Nia's waist, "Come on Kara." She sighed heavily, glancing at Lena. Lena was putting on a strong face, but Alex knew she was terrified with the way she was just too quiet. If Alex didn't know any better, she would have thought that Lena was hiding something. But then, if she was wouldn't she save Nia anyway?

Alex shook her head and carried on watching but noticed something. The water was filling faster, "Supergirl! The water is creeping up to her chest, you'd better do something!"

Meanwhile

Kara soared through the sky so fast that even Sam struggled to keep up. Soon, they both landed outside of somewhere that had been bricked up, and left to rot. Kara nodded at Sam, before they both walked in. Kara rushed down some stairs as she listened for Nia's heartbeat, it was rapid.

Sam followed behind her and listened to both of their heartbeats. If there is one thing Sam could tell about those heartbeats, is that they both beat out of love for each other. An astonishing mother, daughter love and fear.

Soon enough, both women followed the sound of water and soon came to a bunker, and that was where the most horrific sight greeted Kara's eyes. Nia was struggling to keep her head above the water. The girl was absolutely terrified, and it hurt Kara even more. The Kryptonian ran forward, "Nia, I'm going to get you out of there, okay?"

"Mom!" Nia cried out, almost flailing.

Kara's brain short-circuited for a moment. Nia called her 'mom'. That made her instinct kick in more, "Nia, listen to me. I'm here and I'm not going anywhere, do you hear me? Sam and I will get you out, you just need to trust me."

Nia nodded slowly, "I'm scared." Tears ran down her cheeks as she struggled. She even tried to hold out her hand. Just as Kara touched the glass, she instantly yanked her hand away, flinching in pain. As she looked down at the green glow on her hands, she knew straight away what it was.

"Alex! The box contains microparticles of Kryptonite." Kara gasped, stepping away from it. Her heart ached so much when the realisation hit her. She stared at Nia, and all hope faded from her, "I can't save her."

Sam walked towards the cell cautiously and placed her hand on it, having the same effect as Kara, "That shouldn't happen to me. I'm more resistant to this stuff."

"Or were." Kara said to her.

As Sam looked at her, she could see the tear trailing down Kara's cheek, "We can't save her Sam. We don't have the time."

Nia watched the whole thing happening between them and could tell that Kara had given up, "Mom, no. Please, please don't leave me to die." She gasped in tears. At this point, her feet weren't even touching the floor, she was struggling to stay afloat.

Kara could even hear Lena shouting in her ear, begging her and Sam to do something. Both Kryptonian's silently agreed between them, despite how truly awful this was that Nia had to die.

A distraught Kara flew up by the side of the box to meet Nia's eyes, she wasn't going to be a coward, not this time, "Nia, Nia, look at me." Kara said sternly, but with a softer tone. Nia managed to meet her eyes but was freezing cold and that didn't help in her fight for survival.

"There is nothing we can do; this glass is unbreakable. Lillian out did us on this." She shrugged, but not with selfish intentions, "When we first met and ever since, you have said that time will compensate for you telling us information for what we already know is going to happen in the future. Maybe you will be reborn through Lena and I…And we'll meet you again." She smiled sheepishly, "Only this time, we will raise you properly. You will have your moms and I won't vanish, I won't give up. Not for one second. For this very brief amount of time that I have known you, you have taught both Lena and I a lesson in how to be mom's…The next time, we will be better at it." Tears streamed down Kara's face as she watched Nia struggling to even breathe now. Kara wanted her to die in the best way she could despite the situation, only the worst was yet to come.

Nia smiled nervously and nodded. There was one thing she wanted to hear and that was Lena's voice. Just hers one last time.

Sam plugged in a speaker, plugging her phone into it, "Okay Lena, she can hear you now."

The DEO

Alex had tears streaming down her cheeks while the rest of the DEO stood in complete silence. They were watching a young woman, Lena and Kara's daughter about to die and it sent shockwaves throughout the building. Alex was struggling to keep a panic attack at bay while Lena was trying to be strong, but when he time came to talk, she couldn't find anything to say.

"Lena?" She heard Kara's trembling voice through the line.

The Luthor fought back tears, before speaking, "Nia, you are the light of my life. Believe me, we will meet again and if this is time's sick way of making sure that you are born properly, then I suppose it has to happen. Hear this Nia, I love you. I know I didn't say it before I vanished, but I do."

At this point, water was already trying to get up Nia's nose. Everyone could hear her struggling to breathe and if Lena was the one to help her die as peacefully as possible, she was going to do it.

Nia managed to get at least some oxygen, lifting herself from the water through the Kryptonite mesh that was being used, but soon realised that it burned her hand. She had no powers, but she was able to get burned by Kryptonite itself.

"I love you mom!" Nia called out, crying heavily before vanishing beneath the water itself.

"I love you too." Lena muttered, staring at the screen in front of her. She could see that Nia was still fighting, but she guessed that this was the body's natural reaction to drowning. It's instinct to stay alive.

Meanwhile, Sam and Kara watched on in horror and knew the moment that the com line went dead. Kara kept listening for a heartbeat and back at the DEO, they all saw the moment that Kara knew her heart had stopped beating. The way Kara lowered her head, that's what gave it away to Lena.

That's all the confirmation she needed.

Lena turned around to Alex, "I may love your sister." She said with anger and hurt in her voice, "I love her so, so much, but Lillian just made the future set itself in stone. In the future, I'm still going to die. Yes, we have obtained Kara's doppelganger, but everything will fit into place soon enough. I want my daughter back and I want to be with Kara. However, we all know what will happen if I end up with Kara, so her and I...As much as it breaks my heart, we can't be together."

Alex didn't fight her on this one. She didn't have the energy and she also knew that Lena had a point about that. She also knew that if she ended up with Sam, that Nia will never have happened. She couldn't tell if this was selfish or not, but right now, she didn't have the energy to fight this.