A common
plot in
science fiction, and especially
anime. The
future of
humanity is in doubt either through some natural
catastrophe or an
attack by a hostile non-human species. Our only
hope for survival lies in some big-ass
spaceship,
submarine,
mecha, or
battleshp with a really impressive name.
Examples include Yamato, Super Atragon, Kishin Heidan, and most recently Blue Submarine No. 6.