The cliffhanger with which the episode ended was a blast, and the whole music played exudes its cinema-esque mood, though I felt a bit of place for the sci-fi setting.
The ED theme video sequence does indeed hint at the two sides of Witsuarunimitea, but it is only apparent after episode 13; the scene of Yue's demise. However, the very first images of the God flashed at the very start of episode one.
Spoiler:
I have the complete and broader picture. The previous humanity could not dwell on the planet's surface (likely Earth), and that's why created new specimens in an attempt to populate the planet.
However, by excelling and reaching the limits of their scientific knowledge, they lost most of their morals and values along the path. Most likely, nearly all the scientists came to choose to keep all the specimens inside the complex and not allowing them to leave for the surface.
One of them, however, prompted Iceman to escape with Mikoto, and I assume that he release the locks to allow all other specimens to escape; he fear that very soon will end on the same fate as the rest of his colleagues, losing his own sense of humanity as well.
Unfortunately, Mutsumi was apparently left behind and forgotten into oblivion; explains why she's pissed off at the Witsuarunimitea half that Hakuoro holds.
Question:
1. Who is the man that released the hatches to allow the specimens to escape and encouraged both Iceman and Mikoto to escape?
2. Why was the old humanity unable to live on the surface, despite that up there was a healthy ecosystem and atmosphere?
One more episode to finish. What would become Hakuoro, Eruruu, and Aruruu?