In the near future, much of the world has been forgotten at the bottom of the ocean due to rising sea levels. Natsuki Ikaruga, who lives in a small town surrounded and stranded by the sea, is invited by a mysterious woman, Catherine, to search for a treasure in his grandmother's house who was a marine geologist. One day, he dives to the bottom of the ocean in a submarine and encounters a mysterious capsule with a girl sleeping inside. The girl was a humanoid so sophisticated that she could be mistaken for a human.
It's hard to believe that so 
much of it is still intact.
لا أصدِّق أنّه ما زال الكثير منها سليماً
So vieles … ist noch genau wie damals.
No esperaba que se preservara
casi en el mismo estado.
No esperaba que se preservara
casi en el mismo estado.
C’est incroyable.
Tutto questo
Sobrou tanta coisa intacta assim?
Даже на дне моря
не сильно-то изменился.