 PLOT: The film begins with the submarine Nereid visiting Japan,  allowing Yoshizumi a last look at his homeland. The trip does not  fit in with the sequence this scene fits into, in which the sub is  on a desperate race against time from Antarctica to Washington, DC  to deactivate a doomsday device. It is improbable that the sub would  detour to the other side of the world for nostalgic reasons.