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Anime: Blue Submarine No. 6 aka: Blue Submarine Number Six
"A sea of endless blue..."
A four-episode anime, taking place after the apocalypic flooding of Earth by Emperor Scientist Dr. Zorndyke. With the remaining cities ravaged by Zorndyke's army of fish-human hybrids - his "children" and intended heirs to the new world - the last hopes of humanity fall on the remaining submarine fleet, the titular No.6, and cadet-turned-slacker Tetsu Hayami.Aired on Toonami back in its glory days. After Bandai Entertainment completely ceased DVD production, the rights are now in the hands of Discotek Media, who have so far rereleased the series on DVD and Blu-Ray.
After the End: All coastal human cities are underwater as a result of Zorndyke's arctic melting.
Anti-Villain: Zorndyke, depending on whether you sympathize with his motivations.
Apocalypse How: A Class 1. Zorndyke flooded earth's coastal areas. And he is planning to turn it into a Class 4.
Bad Export for You: Discotek's DVD/Blu-ray release only contains the English dub with censored lines of dialogue as they appeared on Toonami and NOT the uncut audio from Bandai's original release. However, they are correcting this by releasing a limited DVD next year with the uncut audio with the improved video quality. Sadly, this will be DVD-only.
Child Prodigy: Huang Mei-Ling is ten years old and operates complex sonar machinery for a military vessel.
Clueless Aesop: something about a cycle of revenge when the enemy really is Always Chaotic Evil (good or at least nice members are killed), are killing the remains of humanity and enjoying it greatly
Conspicuous CG: Gonzo were never known for their ability to believably incorporate CG into their animated series. Blue Sub 6 is among their earliest efforts, so one might forgive them in this case - particularly as the rest of the animation is gorgeous.
Not to mention the severe (though short) beatdown Mutio receives at the beginning of episode 4 (and just before the start of the episode) with a sheathed, heavy sword. Leaving her just enough strength to limp-swim away, bloody and injured.
Nuke 'em: Humanity's back up plan to finish Zorndyke.
"So that's the plan? Nuke the psycho? That's original." -Hayami
Scavenger World: As a result of many of the former cities being underwater now.
Sci-Fi Writers Have No Sense of Scale: While 1 billion people seems like a lot, given the effects of the flood (enough to half-way sink a skyscraper) it should've killed a lot more. To get an idea: there are about 7 billion people currently in the world.
However the flooding due to polar ice melt would not have occurred instantaneously and it is likely that mass evacuation inland occurred. Indeed the vast bulk of the deaths are most likely due to subsequent starvation and disease as the inland areas would have been ill-equipped to support such a massive refugee population, and to attacks by Zorndyke's forces. Musuca 17 / Red Spot for instance relates that his species were tasked to "wander the seven seas, destroying human cities".
The English dub over-corrects and claims 10 billion people died.
Though they did mention that humanity basically solved World Hunger some time before the war started, so that could explain a population boom.