In prior episodes, a scientist has brought about devastating ecological changes to the Earth, flooding most of the land by melting off the polar caps and making Antarctica a habitable paradise populated with his sylvan genetically-engineered creations. The crew of Blue #6 have orders to launch a nuclear strike on the scientist's "base" (a small cabin in a village, as we later see) to stop his flipping of the world's magnetic poles and subsequent extinction of mankind.

The final episode features some incredible battle sequences between the forces of humankind and those of Nature (who have an giant submarine modified from an old battleship) and a somewhat confusing at times anticlimatic confrontation between the main character and the "evil" scientist. Who will win? Will humanity survive at the expense of Nature, or can the two coexist?

The soundtrack is outstanding, performed by a Japanese big band group and includes the stunning, sultry, Jazz-club-esque closing title, Minasoko ni Nemure (literally, "Sleep on the Sea Floor" or "(this thing that) Sleep Inside Everyone." Some may find the juxtaposition of brassy big band jazz sounds over climatic battle sequences a bit off-putting, but for me, they work hand-in-hand and offer a wonderful sensory experience.

Check out the whole series. I saw this episode first and went back to see what I had missed (most of the story won't make sense otherwise) and am glad that I did.