If the immortal did not want to punish the entire world, but only a specific place, then he sent a deluge. Instead of pouring water from the sky, the angry god would raise the sea and swallow the entire area, once and for all. Because after the flood, the rainwaters would recede, the earth would absorb them, and it would manage to reveal itself again, with its stones and soils, its mountains and meadows and everything. But after the deluge... after the deluge no island has ever risen again to the surface, to float and breathe in the sun. They sink so deep into the abyss that even if you search, you cannot find them. This is what happened to Atlantis, and we still call it lost.