Seventieth Floor
Once we one-sidedly defeated the 60th Floor Guardian of the dungeon, we eventually claimed our loot afterwards and received an orichalcum longsword, a relic-grade item. It might be useless for us, but it fetches a handsome amount of money if we sell it.
I got the corpse of the Sandworm as well, to make use of it. The body itself was terribly inedible and poisonous, so I would use it the other way. But its rows of sharp fangs actually consisted of copper. Since it came from a magical being, its properties were also magical, making it good for crafting high-quality materials.
After we claimed our loot, we continued our conquest and proceeded to descend deeper into the dungeon. The floors beyond the 60th were something very Hoenn, full of water.
These floors were apparently called Sea Floors and only the entrance and exit had small stone decks. The floors had a radius of seven kilometers and still had those tall walls surrounding them.