Explorer of the Golden Planet by Acid Style jap cen

Most lands have sunk underwater as a result of large scale wars which
took place all over the earth. Humans barely reestablish civilization and
its maintenance requires a large amount of resources.
However, most resources on the earth have settled on the seafloor!
It is almost impossible to search out and salvage them!!

Therefore, the Government of Earth launches a new planet exploitation project
which is first-ever throughout the history of humankind!!